Found a Cheap/Affordable Solution to replacing the Defrost Duct (s)

On some vehicles, yes. On this particular car, a 1975 Duster 360, Factory A/C car, no. On my 74 Ramcharger SE, factory 440 A/C truck, no.
That’s a pretty rare car u have there. I have 1 that’s non a/c. Sweet ram charger u have also. Kim