This listing is for one replacement Servis Rhino / Alamo gearbox 1-3/4" X 20 spline input shaft code 00759490. Used on many Servis Rhino / Alamo 15' Batwing mowers that had 3 gearboxes. This shaft is the input shaft to the divider gearbox and had a gear mounting on both the front and rear of the shaft. NEW Old Stock Fits gearboxes from the following mowers: Early three gearbox batwing mowers with 1-3/4" X 20 spline shafts.