This may be useful to others; I found a replacement motor @ AM Equipment, Jefferson, Or. It's their Pt. No 238 12v
Left Hand Dynamic Park. You'll also need their connector. 1/2 the price from an A/S dealer.
The catch is : all replacement motors now have a smaller spline shaft than the original motor. Therefore a new pantograph link arm is required. That I ordered from A/S and the part came from American Technology, Elkhart, IN. Their pn AW 69610. I don't know if they will accept direct orders and avoid the A/S price mark up. If you have questions, email me @ email@example.com