Rail Assembly, Right, 12 mm, Part 1542246 is a part that helps guide the track and Support suspension loads. It's a highly engineered structural part that designed and tested by Polaris engineers to ensure quality, strength, stiffness, while Maintaining a light Weight to maximize rider performance through rigorous field and lab validation testing. Buy confidently as Polaris is a trusted powersport provider that has been making snowmobiles since 1954. Spend less time doing tedious Maintenance and more time out on the trails having fun .Don't settle for anything less than OEM quality.