Hey what part of Missouri are you from? also Memphis makes some decent speakers in fiero sizes however most I have heard of prefer a component sub tweeter combo in the front. I have the factory sub in my car with Rodney's speaker replacement. It was a tight fit but it worked. My sound wasn't horrible, but I blew two speakers. Anyway the search function will help with looking for a lot of things.
Honestly, What is a "stock" Fiero?