Category Snowmobile/Ski DooSki Doo - Snowmobile Piston Kits Back Piston Ring R09-766 Snowmobile Parts & Accessories Type: STD 01 (0.25) 02 (0.50) 03 (0.75) 04 (1.00) Viewer:250 Item No: R09-766 Fits: 1974-1977 TNT 440 F/A 1974-1977 Blizzard 438 F/A You May Also Be Interested In Piston Ring R09-779 Piston Ring R09-765 Nut 95380-08600-00 Gasket - Hole Cover 6K8-81365-00