29/575 exhaust shutters
 

OK, 2002 29 Fever with 575. I need to replace the exhaust shutters in the y-pipe for the silent choice. From what I have found there are currently 3 versions, 807166a1, a2, and a3. A1 has the two rubber blocks on the end to slide into notches on the y pipe and looks to be exactly what I have but of course nobody local has any, a2 is huge and way to big, and a3 (what my local dealer had) has the correct size flappers but a plastic cage/carrier attached. Does anyone know if the a1 and a3 are interchangeable? Can a3 plastic cage be inserted where what i assume was an A1 originally? There seems to be lots of people confused on this issue after some brief internet searching.