are all the years of camaros and firebirds interchangable?
if i buy a door from a 83 camaro will it fit a 87 firebird?

 

Yes the doors should interchange

 

All the 82-92 Camaro & Firebird doors are identical. Only differences are the door panels, manual or power windows (motors inside or not), ground fx mounting holes (or none) and the extra bracket for he GTAs different arm rests.