Well if you have the money there are the steel 15" Mustang SSP wheels (over $300 for a set of 4). Steel..., with a bit of flavor (bottom image). I found a couple of SSP Look A Likes on a '88 T-Bird (upper image). They are only 14" (and not as wide), but have the same perimeter holes as the SSP. And, I like the center hole better on these too. BTW, the yard wanted to charge me for this tire! Flat, no tread and a damaged sidewall. Yea, that's $25 on Craigslist "All day long" - NOT! Totally a junk tire.
Most of the Fox body 4 X 4.25" cars went to some form of alloy wheel when they went to 15". But there may be some T-Birds, Mercury's etc. that were 15" steels.