Emissions Control System ID help, 1971 Duster 340

str12-340 said

…on all A-bodies in 1971.

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So if ECS was on all A-bodies by 1971, and typically the fuel cap options are either “w/ECS” or “w/o ECS”, I’m seeing just one option I can choose. That would be “w/ECS” and that would make it a ”non-vented” cap, correct?