You may want to try this place, they do stuff that's not listed too:
https://www.rustreplace.com/home/196...-1981-firebird
They make general 'stock' sections too. You might be able to use the trunk gutter stuff for what you need, or use it to start modding.
You might be able to chop up something from other models too:
https://www.opgi.com/sheet-metal-bod...yABEgKKVvD_BwE
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song:
http://www.youtube.com/watch?v=7zKAS...ature=youtu.be