Most Model A folks want to use a Maverick rear.
The early 5 lug Maverick with the V8 is 56 inches wide.........wheel mounting flange to wheel mounting flange. They are 8 inch Ford rears.
They work good.
I prefer a 9 inch myself.
The 9 inch has better gear selections, better parts supply and will stand more horsepower. Whenever Ford Motor Company installed more than 250 or so Horsepower.......they dumped the smaller 8 inch rear and went to the 9 inch Ford....for it's horsepower ability.
A 1957 to 1959 Ford passenger car rear is 58 inches. So is a 1966 up to the 70's Bronco. The Bronco has the old Ford 5 on 5.5 wheel pattern That's what I have under my 32 .
If you are running fenders........56" - 57" is perfect.
No fenders......No problems......