What else do 1972 dart doors fit?

They will also fit all years of Duster/Demon/Dart Sport, but that would mean swapping out the glass and vent wings. The door shells are the same.

The glass and hardware is different too depending on the year, so if they were to be swapped onto a Duster you'd need '70-'72 glass and hardware (at the least) for the swap. I know the glass and hardware changed in '73, it might even be more specific than that.