Common wheels to tow a ‘64 Barracuda
How much of a gambler are you?
A 5x100mm wheel is VERY close to a 5 on 4", but it is NOT exact. There have been many that have gotten away with using them, but there are hazards (loosening lugs).
There are hundreds of cars that use 5x100 pattern. I'm sure you can find wheels in the boneyard, the question is are the tires any good.
(If your gonna buy new tires, might as wl by them for the right pattern wheels.
I might be tempted to try 5x100, and plan to stop every 25 miles for the first hundred or so, just to check the lugs.
The 5x100s are probably 100 times more common in a boneyard than 5 on 4.... if not a thousand times.
(Google cars with 5x100 wheels)
Edit: each stud would be 1/32" off-center. .031 to be exact.