100% Brand New Authentic Liftmaster Chamberlain Craftsman Part Liftmaster Chamberlain Craftsman Garage Door Opener Comp Gear Kit For 41A5021 Fits these Liftmaster Models: 985, 1240, 1240R, 1245, 1245R, 1245LK, 1250, 1255, 1255R, 1260, 1260LK, 1265, 215WD, 220WD, 315WD, 320WD, 1345, 2245, 2255, 2265, 2565, 3245, 3255, and 3265. Do not use for openers with dual sprockets on the output shaft. Do not use for openers with dual sprockets on the output shaft. Fits these Chamberlain Models: 1100, 1200, 2100, 2200, 4100, 4200, CG40, CG40D, CG42D, PD100, PD200, PD210, PD210D, PD212, PD212D, PD600, PD610, PD610D, PD612KLD, PD612K, 5100, 6200, 7200, 7220, 7320, 7420, 7520D, 4893OD, HD200D. Also fits openers labeled under various names such as: Sears Craftsman, True Value, Master Mechanic, and some units from Wayne Dalton. Liftmaster also "private labeled" openers for regional suppliers and dealers - usually it is very easy to see that it is a Liftmaster opener with a different name on the cover. Compare your parts to the picture above. The Large Gear is 2 3/4" x 1/2" wide, with a 1/2" bore. The worm gear is 1 1/8" OD, and the teeth are 1 1/4" wide (all sizes are approximate).