The mirror is Gentex which is in alot of different car makes. I found theses on a 1999 Buick LeSabre Limited. Personally I don't like the looks of the Corvette side mirrors because of the telescoping look which to me doesn't flow with the styling of a fiero. These are similar, fiberglass and easily modded to fit right. (I hope)
Maybe these will work. They have power,defrost and auto dim.
hercimer01, How did you get the needles on and off without messing the position of the coil up? How did you recalibrate the true position of the needle's offset on the coil (NOT the potentionemter way)??
First I took a good picture of the position of the needles resting position before i started. I popped them off with an upholstery tool, protect the gauge face with a piece of paper under the tool when your prying. They come off ok, it's a little unnerving but doable. When you put them back on, just be sure and put them back where they were when you started. You can verify the speed with your GPS app in your phone and the rest of them aren't critical for position. I haven't noticed anything worthy of concern. Since you have a 3800SC, I used the Torque app to verify the tach. You might have to reposition the needle so its correct.
[This message has been edited by hercimer01 (edited 12-15-2018).]