Craftsman Sears Craftsman Garage Door Opener 1 Drive Gears Works With 81B0045 41A2817 41C4220A This Gear Are Compatible With All Chamberlain Sears Liftmaster Craftsman and Raynor Residential Garage Door Openers Produced After 1984. Drive Gear Bore Size: 1 2 Drive Gear Outside Diameter: 2 3 4 Drive Gear Number of Teeth: 32 Compatible with LiftMaster Chamberlain CHAIN DRIVE garage door opener models: 1040 1045 1046 1050 1055 1056 1060 100WD 200WD 300WD 110WD 210WD 310WD 1260LK 1245LK 215WD 220ED 315WD 320WD 1240R 1245R 1246R 1255R 1256R 985 2565 2575 2595 140 150 240 350 450 550 700WHC 701WHC 1000 2000 4000 4001 5000 710WHC 711WHC 1100 2100 4100 5100 7200 1200 2200 4200 6200 7220 CG40 7420 PD752 PD758S. Compatible with these LiftMaster Chamberlain BELT DRIVE models: 1280 1280R 2580 2585 8100 8100M 8200 9200 WD922K WD912KS WD822KS More Details