Check the listing for details. Len Performance Rear Track Shock | LS4-80001R. Condition: New. Listed at 374.95 USD. Len Performance reservoir snowmobile shocks are designed and built with the focus on the rider. Ready to mount out of the box with preload adjustability and simple 5-click compression and rebound adjustments for front ski shocks, and 5-click compression adjustment on all track shocks. These range of adjustments help the rider easily fine tune their suspension to whatever their needs may be. Aluminum reservoirs feature a finned cooling system which helps prevent performance robing temperatures and increases longevity and performance under the harshest conditions. Only high-grade materials are used including a forged aluminum head and anodizes all aluminum components for increased durability and corrosion resistance. With a focus on rider experience Len shocks are rebuildable and tunable.