Vforce john does all the clutch kits for the teryx. Old and new. Machines the sheaves. Also builds the kits to you riding environment desert, sand, trail, or mud. The work great. Heard of speeds in the 70+ range when using a programmer(he has one as well) with his clutch kit.
VForce John is a Trex Guru. I'll be getting his clutch and programmer soon. He can machine your OEM clutch also, but he's not cheap.....but money well spent