Parting out a 76 Dart Sport Lite

In the 3rd pic, is that a switch for the rear speaker, or rear defroster? If rear defroster, is it the type with a blower/vent type in rear speaker deck, or is it the rear window/grid type defroster? If its for defroster, how much for the switch and complete setup to Jasper Indiana, zip code 47546? Slow/Cheaper shipping is fine, dont need it in a hurry. Thanks!