LiftMaster 41C4220A Garage Door Opener Gear and Sprocket Assembly Replacement Gear and Sprocket assembly compatible with chain drive LiftMaster, Chamberlain Brand Sears Craftsman, Master Mechanic and Wayne Dalton garage door openers 1984 thru current Compatible with LiftMaster Chamberlain garage door opener models 1040, 1045,1050, 1055, 1060, 100WD, 200WD, 300 WD, 1140, 1145, 1150, 1155, 1160, 110WD, 210WD, 310WD, 1240, 1245, , 1250, 1255, 1260, 1260LK, 1245LK, 215WD, 220ED, 315WD, 320WD, 1240R, 1245R, 1255R, 1265, 985, 2265, 2565, 2245, 2255, 140, 150, 240, 350, 450, 550, 700WHC, 1000, 2000, 4000, 5000, 710WHC, 1100, 2100, 4100, 5100, 7200, 1200, 2200, 4200, 6200, 7220, CG40, PD210, PD610, PD612K, 7420