HQRP Drive Gear 2-Pack for Craftsman 41A2817 41C4220 41C4220A Garage Door Opener Access System Coaster HQRP&reg; Replacement Two Drive Gears plus HQRP&reg; Coaster; Compatible with Chamberlain openers manufactured 1984-current; Compatible with Liftmster Sears Raynore openers manufactured 1984-current; 100 Days Warranty!