Great story behind the car.
I stumbled onto a '79 via an online auction.
I regretted the rust at first, but after replacing the floor boards, trunk, and tail section, it's like new!
Each week I am enjoying the car a bit more and repairing/repainting or replacing parts along the way...
Classic Industries offers some 77 stuff.
https://www.classicindustries.com/shop/1977/pontiac/firebird/parts/?q=BUMPER or shorten URL to classicindustries.com
Anyone can buy a new ride; rebuilding your own takes a special kind of Stupid!