I bought the ones from Sirius and the inside hole is not exactly right. It is a bit too large. And yes $90 was way too much for something that didnt fit. I went and got an Oring that fit in the groove of the slider and that "captured" the diaphragm. I also used a bit of sealant/adhesive to make sure that they would stay in place.
Worked for me,,,,,, and the guy I sold the bike to.
I did put about 500 miles on the bike before I sold it and it ran great so the fix was a good one.
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