Most of the Chrysler wheels are only 6" wide (but the offset is usually 35-40 mm). Only two exceptions that I am aware of: The lace style wheel used on the Shelby Lancer and the wheel commonly referred to as the "crab" wheel which was used primarily on the Daytona. Both are 6.5" (careful here... some of the crabs are only 6" wide). Since the Shelby Lancer lace style wheel is very similar to the 15"X7" Fiero lace wheel (and is usually more expensive), there is no distinct advantage to this wheel. I've never been particularly fond of the style of the crab wheel, but one of the guys in the local Shelby Dodge club has had a couple sets fully polished, and I must admit they look very nice. Cost him only $35 each for the polish job. Also, some Fiero fans have used a 15"X6" Chrysler "pizza" style wheel as a replacement for the Fiero Indy wheel. They are all over the junk yards for $15-20 bucks each. They too could be fully polished which would make them look very nice on a Fiero.
The Subaru wheels generally have a much greater offset than the others (around 45-50 mm).
Recent Toyota Celica's have a nice looking 5 spoke wheel, but I believe the center bore needs to be corrected. There seems to be an abundance of these wheels since there has been a fair amount of upgrading by the Toyota owners.
Most of the GM wheels are only 6" wide as well. A couple exceptions that I can think of are the Beretta GTZ (16X7) and the Olds Quad 442 (same). The GTZ wheels look good on a Fiero, but are relatively heavy (about 20 lbs. each).
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FierOmar