Mirror trim retainers
Are you talking about the little plastic clips in the bottom right of this pic?
I've never seen those before. Mine are only held in with that one screw in the middle and have been that way since leaving the factory.
After more searching, I found them in this door panel removal instructions too:
https://www.firebirdnation.com/pdf/doorpanel.pdf
https://www.ebay.com/itm/50-x-Double...AAAOSwQz1bIcc3
ITW Fastex manufactures some smaller double end tree retainers.
Good luck.
Thanks for all the suggestions. I'll keep digging.






