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

DionR said
Doesn't the heater box end take 2 different size hoses, but the vents in the dash are the same size? How did you get past that? Or am I missing it.

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.