The Kohler crankshaft number is 234817-S which a step shaft. It is the same shaft as the engine used on the Gravely 520 two wheel unit with the K181-30676. You may be able to use our conversion kit part number CS12-Gravely-2W-R1, but we cannot guarantee what issues there might be. If you order the engine and cannot use it you would be responsible for return shipping.
