There's also a casting number on the face of the bezel (under the trim plate), but I don't know if the Camaro and Firebird use the same plate or not. The P/N is 7305954, but I don't think the casting number is the same. From some of the pictures I can make out the last 3 numbers of "474" (can't read the first 4 numbers).
mr396, yes, we are neighbors! We'll have to get together some time.