The AC-31 has been sold for many years in different flavors before becoming the AC-35 with a larger case for the standard adapter bolt pattern. I have both the adapter and couplers for all the AC motors, including the AC-31. PM me with a picture of the C face and motor shaft and I will help you.I am looking for a Motor/Adapter plate that will fit 62 bug using a AC-31 motor.
Thanks