liftmaster garage door openers 41a3489 complete trolley assembly

Compatible with LiftMaster and Chamberlain Brand garage door openers 1984 thru current. If square rail assembly see part number 41C5141-1. Compatible with LiftMaster Chamberlain chain drive garage door opener models 1040, 1045, 1046, 1050, 1055, 1056, ADIB00E3KTLI0