Mounts on the Polaris RZR 900 XP4 on the upper and lower forearms. Pretty close to OEM except for the size of the retaining slot. The groove is a little smaller, but the stop bolt goes in tighter. When pushing in the indexing bolt, make sure that the groove is correctly aligned. If you hammer on a screw, you will damage the threads. The installation went very well. Haven't had any problems with these yet. A good alternative to OEM when you need parts quickly.