If anyone is interested in the above mentioned narrow 15x4 inch wide Cragars (that are actually 4-3/4" bolt pattern, not 4-1/2"!!!) I have them for sale on ebay:
https://www.yenko.net/ubbthreads/show...e/0#Post313070
Turns out the guy I bought them from didn't know how to measure bolt patterns! So, maybe someone here can use them.
I am keeping the tires, though.