Fits Wayne Dalton Models: 1280, 1280R, 2580, 2585, 8100, 8100M, 8200, 9200, WD922K, WD912KS, WD822KS. -(1) Drive Gear. -Drive Gear OD: 2-3/4". -Drive Gear Bore Size: 1/2". -Drive Gear Number of Teeth: 32.
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