WTB: 71 Duster Non-AC Heater Box
If Physixx's box won't work for you, I think I still have the one I pulled out of my 73 Duster. I can't vouch for fitment (I would imagine the Physixx's 70 would be more likely to fit), and I am not sure of the blower functionality. I pulled it out of the car right after I got it to put in a new Vintage a/c unit. If interested, let me know and I will take a look for it.