I have Pro Tapers on my 500. They are solid mount, which kinda sucks. Its an upper clamp for a 250. They are available as SUPER STOCK, forget the mfg. The stem is smaller on the 500 so you have to make a thin bushing to take up space in the clamp. Its safe though, because its trapped in there. I actually have considered going back to stock since it is noticably different than the rubber mount, non-vibrating, 250 that I also ride.