That's been unavailable for a LONG time. If you can find a 68 B-body wagon you might find the same switch for the rear window. I had a loose one for my son's 67 Dart (it has a 67 Barracuda dash) that I sold. I installed the wiring, switch, and relays from a LeBaron convertible in his car. I will be doing the same thing in my Barracuda. I put the switch in the console in the ashtray area.
