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|Electrode Tip Material:||Xtreme Performance|
|Thread Diameter:||14 mm|
|Wrench Diameter:||5/8 in|
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Q:are these plugs shorty's for headers? and does Autolite make any
A:This Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug - part# XP24 is vehicle specific. For assisting you further, please provide the year, make, model and engine size of the vehicle. You may also call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.