This spare tire mount for the Polaris line of RZR UTV's features a 4x156mm bolt pattern with your choice of either 3/8" or 12mm wheel studs. These mounts also feature a 4 bolt tube clamp at the end that can mount to your roll cage or harness bar depending on how you want to mount it. The tube clamp is available in two sizes: 1.5" and 1.75" .UTV Driver