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

I found build sheets on top of glove boxs, under seats (front and rear), under carpet and best of all, on the top of the fuel tank, outside of the car. One car I found three.
I parted out one car that had it's build sheet in the typical place in the rear seat back springs, but, also 5 more under the rear seat bottom from 5 different cars built that day. Must have been one of the last cars assembled that day and the installer needed to sweep up his work station.