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|This product doesnt fit any of your saved vehicles||Check Fit for another vehicle|
|Filter Bypass Relief Valve:||Yes|
|Inside Diameter:||3/4"-16 Thd|
|Outside Diameter:||3.13 in|
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Q:Does this work on Harley davidson 2003 Road.king?
A:Great question Chuck! I checked Mobil 1 and according to Mobil 1 this is a direct fit part for your 2003 Harley Davidson Road King. I can certainly understand the confusion finding the right oil filter since this filter is not listed as an exact fit. I see that K&N Part No. KN-171C or KN-171B also fit your motorcycle.