I have this pair with the firewall extension.
Surface rust/junk on them. No rot.
I'm asking $125 a side + shipping for them because they have the extensions on them.
The doors are later than 72 models, unless they are off a Duster/Demon. Darts up to 72 had vent windows.
If the opening mechanism is up high they are 73+ doors.
The doors are essentially the same except for the door lock location. If you get picky the 67-68 doors are the ones you want, door lock location further back.
Good luck with your search and welcome.