Have you ever seen any Dart, Valiant, Demon or Duster with a rear window defroster?

My understanding is the factory style was the blower motor in the rear shelf.
Aftermarket was the copper strips attached to the glass and run with electricity as a dealer add on. Typically aftermarket. Those are very rare and seldom work, customers did not need them due to the angle of the glass. The blower style was for fogging of the glass in cold weather.
Syleng1