You can always use the standard 4 x 6 sealed beams but you'll need to chop your buckets and make something to hold them in. Due to Fiero specifications you will need to be very creative to fit other car type headlights. I am in Canada and I sell Low Profile Bucket kits which are almost pl.ug and play. Did alot of trials with different type of headlights but NOTHING was bolt on.
Here are some pics of kits I sell if you ever decide to go that way
Black Widow Build Thread 2007 - 2014 Tylers Toy
My Low Profile Buckets for sale My LED Sidemarkers for sale