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I have a 73 Delta 88 Royale convertible and I am in the process of rebuilding a dashboard that was missing several components. I have a mystery rubber gasket but I'm not sure where it should go. A/C or ductwork? Does anyone have any insight? It's roughly about 5" x 5".
I first saw the pic and thought it was a gasket for one of the air vents. At 5"x5" I think it's probably a gasket for the air plenum. Check under your dash and check for air leaking out of the plenum with the fan on HI.
