Avanti 2002 Gas Door Cover

[juy8q891]

I snapped the gas door cover off my 2002 convertible. GM part # 10284455 (the Pontiac Firebird part) will not fit. It is 6 inches across and metal. The Avanti door is 5 inches across. In addition, the Avanti arm which attaches to the back of the door and goes into the fender is made out either plastic-like or fiberglass. The arm is the part that snapped in half. he body shop cannot glue it back together. Any thoughts? If the door itself is not Pontiac, what could it be. I hope it is not something Avanti made up.

[Gunslinger]

It's probably something Avanti designed and made for the car.  Can the arm that attached it to the car be removed and taken to a fabricator out of metal?