LIFTMASTER Garage Door Openers 41A5434-14 Belt Assembly Full belt assembly for use with LiftMaster belt drive models 2500, 2580, 2280, 3500, 3580, 3280. Full belt assemby for use with Chamberlain belt drive models WD822K, WD922K, WD912K. For 10 FOOT HIGH GARAGE DOORS "T"-Rail assembly ONLY. Also part number 001A5434-14A