Liftmaster/Chamberlain 7' Belt Drive Assembly Fits the following models 2500, 2580, 2280, 3500, 3850, 3280, 3280M, 2585, 3585, 2500B and 2500D WD822K, WD922K and WD912K
Liftmaster/Chamberlain 10' Belt Drive Assembly (for 10' High Doors Only)
Also known as: 041A5434-14A 041A5434-14 and 41A5434-14A