YOu can probably find some 15x7 6 lug steel rims at the junk yard that'll take more modern hubcaps. I'm not sure if GM ever made a 15x7 6 lug rim that'll take clip style hubcaps.
The problem is going to be finding some that take your stock hubcaps. Your stock hubcaps probably use the clips, which require a certain pattern on the middle of the rim. The more common and later rims have a hubcap that goes right on the rim, sometimes called 'baby moons.' I would bet you can find baby moons that look like the original hubcaps and fit on the more modern rim. That's what I did.
Modern rims in the 15x7 six lug variety are $10 apiece, if you pull them yourself.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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