Liftmaster 41A3489 Garage Door Opener Carriage LiftMaster Liftmaster garage door opener complete trolley (carriage) assembly. Compatible with chain drive operators made by Liftmaster, Chamberlain, Sears, Craftsman, Wayne-Dalton and Master Mechanic. For Liftmaster Chain Drive garage door openers from 1984 to present. Genuine Liftmaster replacement part.