There was person on the Fiero Forum that used to provide a 86-88 GT taillight lens restoration service. He took GT lenses that look absolutely terrible and refinished them to look like new (or very close to that) again.
Do not throw out this old icky 86-88 GT lenses. You can maybe make them look like new again! A few have offered this service. Search the forum to see if anyone is offering this service yet today.
I am very happy with my tail lights that Napoleon_Tanerite refinished. I wouldn't hesitate to get another set done.
Received my lenses back today, and I can say without a doubt.....this man performs miracles. While mine weren't terribly delaminated....there were scratches and several imperfections; but you would damn near need a microscope to find those problems today. If you been sitting on the fence, wait no longer. You will not be disappointed!