1973 Buick Centurion Engine Timing Parts

Keep Your 1973 Buick Centurion in Top Shape with Quality Engine Timing Parts

Whether you’re repairing or upgrading your Engine Timing Part, using high-quality parts is key to keeping your 1973 Buick Centurion looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Timing Cam Gears, Timing Covers, and Timing Chains. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Competitive Prices and Extensive Inventory

The average price for a 1973 Buick Centurion Engine Timing Part at Advance Auto Parts is around $36.90, with a range that starts at $4.29 and goes up to $217.99. With 13 options in stock from 3 trusted brands, finding the right fit is easy. Popular picks like Timing Cover Assembly, Engine Timing Cover Seal, and Engine Timing Set start at just $9.99 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Engine Timing Part, don’t forget to check out other key components like Engine Gaskets and Seals and Oil Delivery Parts. At Advance Auto Parts, we’re here to help you keep your 1973 Buick Centurion in peak condition, inside and out.

Essential 1973 Buick Centurion Engine Timing Parts

Cloyes Gear – Engine Timing Crankshaft Sprocket (Part No.S323)

Engine Timing Crankshaft Sprocket

from

$4.29
Along with the timing chain, tensioners, and guides, sprockets are an integral component within the timing system. Timing gears and sprockets are available as part of complete timing kits as well as for individual purchase and installation

Product Features:
  • Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Refer to our online catalog for detailed application-specific information
See More

Cloyes Gear – Engine Timing Crankshaft Sprocket (Part No.S369)

Engine Timing Crankshaft Sprocket

from

$18.99
Along with the timing chain, tensioners, and guides, sprockets are an integral component within the timing system. Timing gears and sprockets are available as part of complete timing kits as well as for individual purchase and installation

Product Features:
  • Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Refer to our online catalog for detailed application-specific information
See More

Cloyes Gear – Engine Timing Camshaft Sprocket (Part No.S334T)

Engine Timing Camshaft Sprocket

from

$15.99
Along with the timing chain, tensioners, and guides, sprockets are an integral component within the timing system. Timing gears and sprockets are available as part of complete timing kits as well as for individual purchase and installation

Product Features:
  • Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Refer to our online catalog for detailed application-specific information
See More

Cloyes Gear – Engine Timing Camshaft Sprocket (Part No.S398T)

Engine Timing Camshaft Sprocket

from

$20.99
Along with the timing chain, tensioners, and guides, sprockets are an integral component within the timing system. Timing gears and sprockets are available as part of complete timing kits as well as for individual purchase and installation

Product Features:
  • Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Refer to our online catalog for detailed application-specific information
See More

Cloyes Gear – Engine Timing Set (Part No.C-3083)

Engine Timing Set

from

$45.99
Sprockets Are Made From High Alloy Steel, and Heat-Treated For Durability. Chain Is Pre-Stressed and Heat-Treated For Longevity. SET INCLUDES: C498 Engine Timing Chain (1 EA), S369 Engine Timing Crankshaft Sprocket (1 EA), S398T Engine Timing Camshaft Sprocket (1 EA).

Product Features:
  • Utilizes the latest in design and technology to offer complete chain sets
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Utilizes the latest in design and technology to offer complete chain sets
  • Refer to our online catalog for detailed application-specific information
See More

Cloyes Performance – Engine Timing Set (Part No.9-1132)

Engine Timing Set

from

$74.99
Billet Crankshaft Sprocket Has Three Keyways for +/- 4 Degrees Adjustability. Crankshaft Sprocket Heat Treated for Durability. Seamless TRUE Roller 0.250″ Roller Diameter Chain for Reduced Friction.

Product Features:
  • The complete kits, which meet or exceed OEM performance requirements, ensure a quiet and maintenance-free experience
  • Cloyes parts are CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Cloyes Timing Kits may include camshaft sprockets, crankshaft sprockets, timing chains, tensioners, and guides
  • Refer to our online catalog for detailed application-specific information
  • Keep your engine’s valve train in perfect time with Cloyes, the world leader in timing drive systems.
See More

Cloyes Gear – Engine Timing Set (Part No.C-3003K)

Engine Timing Set

from

$32.99
Sprockets Are Made From High Alloy Steel, and Heat-Treated For Durability. Chain Is Pre-Stressed and Heat-Treated For Longevity. SET INCLUDES: S334T Engine Timing Camshaft Sprocket (1 EA), S323 Engine Timing Crankshaft Sprocket (1 EA), C359 Engine Timing Chain (1 EA).

Product Features:
  • Utilizes the latest in design and technology to offer complete chain sets
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Utilizes the latest in design and technology to offer complete chain sets
  • Refer to our online catalog for detailed application-specific information
See More

Felpro – Engine Timing Cover Seal (Part No.15200)

Engine Timing Cover Seal

from

$9.99
Fel-Pro gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Validated for fit, form, and function
See More

Dorman – Timing Cover Assembly (Part No.635-531)

Timing Cover Assembly

from

$217.99
This direct replacement timing cover matches the fit and function of the original equipment cover for a reliable repair. This part has undergone extensive testing to ensure adherence to precise design standards.

Product Features:
  • Direct replacement – this engine timing cover matches the fit and function of the original equipment cover
  • Durable construction – this part is specifically designed to withstand extreme underhood temperatures for a long service life
  • Cost-effective solution – offers original equipment quality at a competitive price
  • Quality tested – this part has undergone extensive testing to ensure a quality fit and long service life
See More

Cloyes Performance – High Performance Timing Chain (Part No.9-143)

High Performance Timing Chain

from

$17.99
Street Performance 3/8″ Pitch Double Roller Replacement TRUE Roller Chain. Seamless 0.250″ Roller Diameter. Heat Treated and Processed Links to Maximize Breaking Strength while Remaining Ductile for Toughness. Pre-stressed to Increase Fatigue Life.

Product Features:
  • A timing chain synchronizes the rotation of the crankshaft and camshaft(s), ensuring proper timing of the engines valve events for each cylinder
  • Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • From stock replacement to high performance, Cloyes has the most complete timing chain catalog
  • Cloyes parts are CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Cloyes recommends the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced as these components play a vital role in system stability and accurate timing
  • Refer to our online catalog for detailed application-specific information
  • Keep your engines valvetrain in perfect time with Cloyes, the world leader in timing drive systems
See More

Cloyes Gear – Engine Timing Chain (Part No.C498)

Engine Timing Chain

from

$29.99
A timing chain synchronizes the rotation of the crankshaft and camshaft(s) ensuring proper timing and allows the engine’s valves to open and close during each cylinder’s firing. Available in kits or as a stand-alone product, our chains are pre-stressed and heat-treated for increased durability. Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment

Product Features:
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • CAD designed and manufactured using premium materials
  • Refer to our online catalog for detailed application-specific information
  • Pre-Stressed And Heat-Treated For Increased Durability. Precision Cut Plates And Rollers With Smooth Finish. Precision Pitch Control For Proper Chain To Sprocket Tooth Fit.
See More

Cloyes Performance – High Performance Timing Chain (Part No.9-149)

High Performance Timing Chain

from

$20.99
Street Performance 3/8″ Pitch Double Roller Replacement TRUE Roller Chain. Seamless 0.250″ Roller Diameter. Heat Treated and Processed Links to Maximize Breaking Strength while Remaining Ductile for Toughness. Pre-stressed to Increase Fatigue Life.

Product Features:
  • A timing chain synchronizes the rotation of the crankshaft and camshaft(s), ensuring proper timing of the engines valve events for each cylinder
  • Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • From stock replacement to high performance, Cloyes has the most complete timing chain catalog
  • Cloyes parts are CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Cloyes recommends the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced as these components play a vital role in system stability and accurate timing
  • Refer to our online catalog for detailed application-specific information
  • Keep your engines valvetrain in perfect time with Cloyes, the world leader in timing drive systems
See More

Cloyes Gear – Engine Timing Chain (Part No.C359)

Engine Timing Chain

from

$15.99
A timing chain synchronizes the rotation of the crankshaft and camshaft(s) ensuring proper timing and allows the engine’s valves to open and close during each cylinder’s firing. Available in kits or as a stand-alone product, our chains are pre-stressed and heat-treated for increased durability. Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment

Product Features:
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • CAD designed and manufactured using premium materials
  • Refer to our online catalog for detailed application-specific information
  • Pre-Stressed And Heat-Treated For Increased Durability. Precision Cut Plates And Rollers With Smooth Finish. Precision Pitch Control For Proper Chain To Sprocket Tooth Fit.
See More

Most Popular Timing Cam Gears for 1973 Buick Centurions

Enhance your 1973 Buick Centurion with one of the 2 Timing Cam Gears we have in stock, starting at just $15.99.

Cloyes Gear – Engine Timing Camshaft Sprocket (Part No.S398T)

Engine Timing Camshaft Sprocket

from

$20.99
Along with the timing chain, tensioners, and guides, sprockets are an integral component within the timing system. Timing gears and sprockets are available as part of complete timing kits as well as for individual purchase and installation

Product Features:
  • Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Refer to our online catalog for detailed application-specific information
See More

Cloyes Gear – Engine Timing Camshaft Sprocket (Part No.S334T)

Engine Timing Camshaft Sprocket

from

$15.99
Along with the timing chain, tensioners, and guides, sprockets are an integral component within the timing system. Timing gears and sprockets are available as part of complete timing kits as well as for individual purchase and installation

Product Features:
  • Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Refer to our online catalog for detailed application-specific information
See More

Best-Selling 1973 Buick Centurion Timing Cover

Upgrade your Centurion with our best-selling Timing Cover.

Dorman – Timing Cover Assembly (Part No.635-531)

Timing Cover Assembly

from

$217.99
This direct replacement timing cover matches the fit and function of the original equipment cover for a reliable repair. This part has undergone extensive testing to ensure adherence to precise design standards.

Product Features:
  • Direct replacement – this engine timing cover matches the fit and function of the original equipment cover
  • Durable construction – this part is specifically designed to withstand extreme underhood temperatures for a long service life
  • Cost-effective solution – offers original equipment quality at a competitive price
  • Quality tested – this part has undergone extensive testing to ensure a quality fit and long service life
See More

Top-Quality Timing Chains for 1973 Buick Centurions

Choose a high-quality OEM or aftermarket Timing Chain for Buick Centurions and enjoy top-notch performance from $15.99.

Cloyes Gear – Engine Timing Chain (Part No.C359)

Engine Timing Chain

from

$15.99
A timing chain synchronizes the rotation of the crankshaft and camshaft(s) ensuring proper timing and allows the engine’s valves to open and close during each cylinder’s firing. Available in kits or as a stand-alone product, our chains are pre-stressed and heat-treated for increased durability. Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment

Product Features:
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • CAD designed and manufactured using premium materials
  • Refer to our online catalog for detailed application-specific information
  • Pre-Stressed And Heat-Treated For Increased Durability. Precision Cut Plates And Rollers With Smooth Finish. Precision Pitch Control For Proper Chain To Sprocket Tooth Fit.
See More

Cloyes Performance – High Performance Timing Chain (Part No.9-149)

High Performance Timing Chain

from

$20.99
Street Performance 3/8″ Pitch Double Roller Replacement TRUE Roller Chain. Seamless 0.250″ Roller Diameter. Heat Treated and Processed Links to Maximize Breaking Strength while Remaining Ductile for Toughness. Pre-stressed to Increase Fatigue Life.

Product Features:
  • A timing chain synchronizes the rotation of the crankshaft and camshaft(s), ensuring proper timing of the engines valve events for each cylinder
  • Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • From stock replacement to high performance, Cloyes has the most complete timing chain catalog
  • Cloyes parts are CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Cloyes recommends the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced as these components play a vital role in system stability and accurate timing
  • Refer to our online catalog for detailed application-specific information
  • Keep your engines valvetrain in perfect time with Cloyes, the world leader in timing drive systems
See More

Cloyes Gear – Engine Timing Chain (Part No.C498)

Engine Timing Chain

from

$29.99
A timing chain synchronizes the rotation of the crankshaft and camshaft(s) ensuring proper timing and allows the engine’s valves to open and close during each cylinder’s firing. Available in kits or as a stand-alone product, our chains are pre-stressed and heat-treated for increased durability. Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment

Product Features:
  • Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • CAD designed and manufactured using premium materials
  • Refer to our online catalog for detailed application-specific information
  • Pre-Stressed And Heat-Treated For Increased Durability. Precision Cut Plates And Rollers With Smooth Finish. Precision Pitch Control For Proper Chain To Sprocket Tooth Fit.
See More

Cloyes Performance – High Performance Timing Chain (Part No.9-143)

High Performance Timing Chain

from

$17.99
Street Performance 3/8″ Pitch Double Roller Replacement TRUE Roller Chain. Seamless 0.250″ Roller Diameter. Heat Treated and Processed Links to Maximize Breaking Strength while Remaining Ductile for Toughness. Pre-stressed to Increase Fatigue Life.

Product Features:
  • A timing chain synchronizes the rotation of the crankshaft and camshaft(s), ensuring proper timing of the engines valve events for each cylinder
  • Our chains are engineered and manufactured with precision pitch control for proper chain-to-sprocket tooth fitment
  • From stock replacement to high performance, Cloyes has the most complete timing chain catalog
  • Cloyes parts are CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Cloyes recommends the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced as these components play a vital role in system stability and accurate timing
  • Refer to our online catalog for detailed application-specific information
  • Keep your engines valvetrain in perfect time with Cloyes, the world leader in timing drive systems
See More

Top Picks for 1973 Buick Centurion Timing Sets

Invest in one of our 3 durable Timing Sets for your 1973 Buick, knowing you’re getting trusted brands and expert craftsmanship.

Cloyes Performance – Engine Timing Set (Part No.9-1132)

Engine Timing Set

from

$74.99
Billet Crankshaft Sprocket Has Three Keyways for +/- 4 Degrees Adjustability. Crankshaft Sprocket Heat Treated for Durability. Seamless TRUE Roller 0.250″ Roller Diameter Chain for Reduced Friction.

Product Features:
  • The complete kits, which meet or exceed OEM performance requirements, ensure a quiet and maintenance-free experience
  • Cloyes parts are CAD designed and manufactured using premium materials. Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Cloyes Timing Kits may include camshaft sprockets, crankshaft sprockets, timing chains, tensioners, and guides
  • Refer to our online catalog for detailed application-specific information
  • Keep your engine’s valve train in perfect time with Cloyes, the world leader in timing drive systems.
See More

Cloyes Gear – Engine Timing Set (Part No.C-3083)

Engine Timing Set

from

$45.99
Sprockets Are Made From High Alloy Steel, and Heat-Treated For Durability. Chain Is Pre-Stressed and Heat-Treated For Longevity. SET INCLUDES: C498 Engine Timing Chain (1 EA), S369 Engine Timing Crankshaft Sprocket (1 EA), S398T Engine Timing Camshaft Sprocket (1 EA).

Product Features:
  • Utilizes the latest in design and technology to offer complete chain sets
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Utilizes the latest in design and technology to offer complete chain sets
  • Refer to our online catalog for detailed application-specific information
See More

Cloyes Gear – Engine Timing Set (Part No.C-3003K)

Engine Timing Set

from

$32.99
Sprockets Are Made From High Alloy Steel, and Heat-Treated For Durability. Chain Is Pre-Stressed and Heat-Treated For Longevity. SET INCLUDES: S334T Engine Timing Camshaft Sprocket (1 EA), S323 Engine Timing Crankshaft Sprocket (1 EA), C359 Engine Timing Chain (1 EA).

Product Features:
  • Utilizes the latest in design and technology to offer complete chain sets
  • CAD designed and manufactured using premium materials
  • Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance
  • Utilizes the latest in design and technology to offer complete chain sets
  • Refer to our online catalog for detailed application-specific information
See More

Our Timing Cover Seals for 1973 Buick Centurions

Make a smart move for your 1973 Buick Centurion with our Timing Cover Seal for $9.99.

Felpro – Engine Timing Cover Seal (Part No.15200)

Engine Timing Cover Seal

from

$9.99
Fel-Pro gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Validated for fit, form, and function
See More

FAQs for 1973 Buick Centurion Engine Timing Parts

What are the best-selling Engine Timing Parts for 1973 Buick Centurions?

Out of 13 Engine Timing Parts that fit 1973 Buick Centurions, the following parts are the top sellers:

What’s the price range for 1973 Buick Centurion Engine Timing Parts?

The prices of Engine Timing Parts for the 1973 Buick Centurion range from $4.29 up to $217.99 for the most premium parts.

What is the average price of an Engine Timing Part for a 1973 Buick Centurion?

The average price for Engine Timing Parts for the 1973 Buick Centurion is $36.90. Keep in mind the variety of part types within our Engine Timing Part category, where you are likely to find a wide range of prices across a variety of parts and components.

What are the cheapest Engine Timing Parts for my 1973 Buick Centurion?

The cheapest 1973 Buick Centurion Engine Timing Parts we carry are:

Does Advance Auto Parts sell Engine Timing Parts for any other 1973 Buick models?

Yes. We stock Engine Timing Parts for 6 other popular 1973 Buick models. Some of the most popular are 1973 Regal Engine Timing Parts, 1973 Century Engine Timing Parts, 1973 LeSabre Engine Timing Parts, 1973 Riviera Engine Timing Parts, and 1973 Electra Engine Timing Parts.

What types of Engine Timing Parts do you sell for my 1973 Buick Centurion?

As of 11/2/25, these are some of the most in-demand types of Engine Timing Parts for a 1973 Buick Centurion:

Can I get help with 1973 Buick Centurion Engine Timing Part orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Buick Engine Timing Parts and more.

What is your return policy for Buick Centurion Engine Timing Parts?

Advance Auto Parts keeps returns simple. For new Buick Centurion Engine Timing Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.