LIFTMASTER Garage Door Openers 41A3589-1 Belt 8' Door Full belt assembly for use with LiftMaster belt drive models 1270, 1280, 1280R. Full belt assembly for use with Chamberlain belt drive models 8100, 8200, and 9200. For standard 8 foot high garage doors. "T"-Rail assembly ONLY. Belt length end to end 256".