We are using Venom Products Boost Weights, designed and manufactured by the same people who test, tune, and design Polaris factory clutch parts. They fit, work, and perform exactly as they should. No gimmicky claims, you can adjust the shift to work with your riding style or tuning. Venom Products Adjustable shift weight kit for Polaris Patriot Boost Snowmobile applications. 74 Gr to 94 Gr. Fits P22 clutch only.