I have a 9.5 that I've tried several different spurs on, Mod1 is the way to go. I obliterated a 66t 32p Kimbrough with my Lehner 2800xl, and the HPI 52t ones just barely stands up to it. Would a nylon one work better in my case? I actually wish I could use steel spurs, but that would screw over the pinion, so forget that. As it is, the way i have to mount a plastic spur on the diff is pretty ghetto anyway, did they ever make a composite or nylon or whatever one for the 9.5?