Jesel products are half-*ssed at best! The fit for most of their belt drives is questionable at best and usually requires some sort of machining to make them usuable. They make some decent parts but as a complete system/package they aren't very good. I am very fortunate that my machinist/engine builder was able to build my belt drive for my R3 W9 engine. It works perfectly! I bought the cam gear and hub it attaches to used off E-bay for $75, it was off a sbc, and he made a new hub, bottom gear, and the cam retainer plate incorporating the bearings and seals needed for it. I don't remember how much it cost altogether but for what Jesel charges I'm sure I could have built at least three of them! There is a group buy here on Moparts, I wish all the guys that go in on it good luck...