compare the pic of red wheel posted above with HPMike's pic of a 450. The 450s (and 15" Rallyes) used a 14 inch center. The outer ring has a pretty noticeable step that makes up for the difference in diameter.

Steel wheels and dog dishes look pretty cool regardless. Its one of the detail things.

BTW, the best 450 wheel story I have is junkyarding with a couple friends. It was an old-school junk yard about 4 years ago. We were walking in and my friend spots a polyglas tire and rim laying face down in the mud. He flips it over to see what's there and it was a G60 with a very nice 450 wheel. He got it for $20 if memory serves. It killed me not to have seen it first

We found a couple of nice 69 H-wheels there as well.