A few suggestions:
1. Anything you can get from Rodney, get from Rodney. Tie rod ends, for example. His stuff is solid.
2. The Fiero Store is a great resource. I have thousands of dollars of their parts on my Fiero, including their ABS headliner, which is great. And...*some* of their stuff is just not that great. Like the power door lock buttons.
3. Yes, GT tail lights are a problem without a good solution if you want to keep an OEM look. The external paint and clear process that someone here does is probably the best combination of cost and availability.
4. GT sail panels can be had readily, but they are not quite an exact OEM match. Unless you are doing a concours restoration they are just fine.
I've done shocks, struts, 1" lowering springs, rear tie rod ends, and front outer tie rod ends, and the steering damper on my Fiero. It does make a difference. It doesn't make it into a car that handles like my Sky.
I have not done the bump steer kit. And I don't personally know anyone who has. Would like to hear from those who've done it how much of a difference it makes.
Edit to add:
On the sunroof (known as the "Vista View" option), make sure you replace the tracks if they are degraded before you change the seal. If the car will be run in the rain, check for the weep holes in the groove. Add if needed. Be careful with the latch hardware- the handle mechanism is a bit hard to find in good condition.
[This message has been edited by lorennerol (edited 04-19-2017).]