Heat/AC box resto kit.
I've never had great luck with clear lacquer on metal like that. I sandblasted my doors and sprayed them with satin black rust paint, then glued the foam on with Super 77. Worked perfectly.
I repaired some damaged rivet holes with Plastic Epoxy then redrilled the holes. With washers on the back (inside), new rivets went in perfectly.
I scrubbed the airbox clean, sanded it a bit and gave it a couple of coats of clear. Very happy with the results.