Some of the vanes on the outer air vents of the dash are broken off. I found a perfect set of replacements but I can't seem to figure out how to get to the screw that is behind the body molding. I can get the front two screws out the the front side screw out but can't figure out how to get to the rear side screw.
I have done one change on my first Fiero. It was very difficult because I did it without removing the dash. It's extra time and work, but it's truly the only way to do it. Removing the dash really isn't all that hard. The Gotcha's are the 4 screws inside the speaker covers that hold the dash to the body at the bottom of the windshield. With the speaker grills removed, you can see them, pointed at the front of the car. Once you have all the screws loose, you only need slide the dash back a few inches to access that one single hidden screw on the vent.
I've never tried it, but it might also be possible to access that screw by removing the A pillar trim, but unless you know how, you stand a good chance of breaking the tabs that hold the trim in place.