I assume you have a different catalog than I do... I'm just looking at the downloaded one straight off PY's website for Firebird. Page 111 has door locks, fuel doors, and license lamps...no brakes.

Regardless, your local auto parts store will absolutely be able to set you up with basic drum rebuild stuff to make it all work as good as new again, if that's all you're after. Frankly, almost EVERYTHING mechanical for these cars can be sourced thru local auto parts stores...but their parts will be ONLY functional...not concourse (with proper casting #'s, date codes, etc). If you want both functional AND concourse, then repro houses or NOS at old dealers will be your alternatives.