Here's the Defroster motor and ducting with bezel. Not sure if it works but squirrel cage spins. Hose needs to be replaced. $40 plus shipping. Comes with the wiring harness from the dash back to the package tray.
Marty, do you have any Bill Luke Key chains? My 79 300 was bought new there. I have the original sales contract and license plate frame but no key chain.