Was looking at flush mount caps to put on the 05 WG,why all the different part #'s.There are a bunch of different #'s per model Dyna,Touring,etc , are the gas caps not interchangable?What is the difference between them ,I thought the tanks were all the same but there I go again thinking.

 

The Fat Bob and Street Bob share the same tank but touring bikes tanks are exclusive to JUST touring bikes, the stuff's weird like that ya know?