This listing is for one replacement Servis Rhino / Alamo gearbox 1-3/4" X 20 spline input shaft code 00758689. Used on many Servis Rhino / Alamo gearboxes. Please see position 32 in the exploded view diagram. Fits gearboxes from the following mowers: 260, 272, and 284 TW60, TW72, TW84 and TW96 Turbo 96 SE10-4A, SE15-4A, SE15