Originally Posted by mikeo0o0o0

If the canister looks like a coffee can then that's a vacuum reservior not the charcoal canister.
Carpenter or LMC won't have them, possibly some obsolete suppliers might, I'd have to search, salvage yard or I see them occasionally on e-bay.
Do you "need" them? Not really. The only function of the evaporative emission control system was to route the gasoline vapor from the fuel tank into the charcoal canister then up to the air filter housing where it would be sucked into the engine and burned rather than dumping the raw vapor into the atmosphere where it would contribute to air pollution.