Hydro static wheel motor is made by Hydrogear who is the OEM manufacturer for Ariens, Gravely, Snapper Pro and Wright. This is the same motor that is on the machine when it comes off the assembly line.
Hydro gear's part number is HGM-12P-7172
ARIENS: 00882300 04115500
GRAVELY: 00882300 04915500
SNAPPER PRO: 50230117046255
Wright Stander: 32410004