The rear is out of a  Cushman golf course utility vehicle.  Came with posi. i know the rear never saw any hard use being pushed by a 5HP motor. :-)  Cushman did put 9"'s in some of their scooters in the early 60's.
I got lucky, No cutting. Just put it in after welding on some spring perches. Ford axles, so had to use ford wheels.
It's a tight fit.with 245 60-14 tires. About a 1/4" to 3/16"  clearance near the wheelwells and the springs. I never had tire rub with normal tires. With the  M&H DOT's, the sides bulge and I get rub with three or four people in the car, never with two. Not enough to make any changes about. No room for wider rims or tires, that's for sure.
 
The rear measures 58 7/8" hub to hub. Using 14' X 7" wheels with  5" backspacing. 245 X 14  M&H DOT tires. Springs are in stock location.

Most wheels,  factory and aftermarket off 4.5" backspacing. Couldn't get 4.5" backspacing wheels to work.

I took Mopar/Ford magnum 500 steel wheels, cut the welds holding the centers.  Moved the centers out to give more backspacing and to make it where the wheels would be centered in the wheel wells. I spun the rims on a brake lathe. Had wobble and runout.. As I was spinning them, I  tapped the edges to get the wobble out. Then welded them back up after the wheel spun straight and true.  Cheaper and easier than shortening the rear end. If the rear was 1" narrower it would have been the same width as the stock Chevy II.

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