I'm going to be running a set of 14," late 80's, T-Bird steel wheels. They have a very similar look to the 15" SSP Mustang wheels. The hole shape, count etc. are identical. They are just an inch shorter and (sadly) not as wide. I'll use chrome rings ("Dustbuster" Aerostars are a great source for 14" rings). I got two wheels off a '88 T-Bird. Still trolling Pick A Part for the other two. '88 was the last year for the jellybean shaped T-Birds. So they are now 26-31 years old. The parts just aren't a dime a dozen anymore.
The first picture is a real SSP wheel. The second is the (actual) 14" "look a like." And frankly I like the center hole on the look a like better.