Ski-Doo New OEM Rear Suspension Torque Arm Update Kit REV-XP 137" Track Ski-Doo rear suspension rear torque arm upgrade kit, part number 860 2003 05. This is a factory original equipment kit, not aftermarket Improve the ride of your 2008 ski doo xp with this kit, turns your suspension to a 2009.?A way better ride over the stutter bumps and small trail junk. Fits: REV-XP models with 137" track length