Standard Mounts - will work on Gen 4 and older Ski-Doo's, and many other snowmobiles, EXCEPT sleds with the Hayes Brake System and the Polaris RMK (2011-newer) & Assault (up to 2016)- that come with Factory Pro Taper Lo/Med/Hi Rise Bars
RMK Pro-Taper Mount - will work on Polaris snowmobi