Ski-Doo Maintenance Kit For Drive Pulley-REV-XM, REV-XU REV-XM, REV-XU Includes: 1 Spring Cover Ass'y, 3 Rollers Ass'y, 1 Bushing (Siding Flange), 6 Slider Shoes, 6 O-Rings, 1 Circlip, 3 Cotter Pins & 3 Lever Axles. 2012 (1200), 2012 to 2015 (600 E-TEC High Altitude & 2013 - 2015 Tundra Xtreme)