A lot of folks use "Classic Parts" or "Jim Carter's" for items like that. I've heard others mention "Chevys of the 40's" and "Patricks". "Brothers", "The Filling Station", and "LMC" get mentioned a lot. There are a lot of sources out there, and this list is hardly exhaustive.
Most of us probably have favorites, but these are mentioned often.
Welcome to the Stovebolt and have fun with the '53.
