Charcoal Canister?

They were made to last through a reasonably-foreseeable service lifespan. These cars we talk about on here are long past the end of their intended lifespan. When you drive an unusually old car, you're going to wear out unusual things: ignition keys, dashboard chrome…emissions canisters.

Yes, many of them were made by GM's Rochester Products division. Yes, people have installed an ordinary fuel filter in the hose to prevent migration of charcoal granules when the foam inside the canister fails, but that's a short-term, get-by measure. Yes, aquarium charcoal is a fine refill. Mattax, if I were "grading" your rebuild I'd give it an A; that's nice work.

Info on adapting non-original canisters and how to hook up an inline purge valve here.