If you have the original rims they should be 7.00 x 18 three-piece like I have on mine. After some significant research and pondering, I think I'm going to go with the 19.5s I found on a 58 or 59 (not sure which) Chevy Viking that's in a junk yard nearby. They're tubeless one-piece rims and the bolt pattern, lug nuts, and center hole are the same (by eyeball - I'm taking one of the original rims with me next time I go). The off set appears to be right as well. Good luck in your search.
