'63 Dart wagon rear door glass.

Yes, I was still referring to the rear doors. In the trade, we still call them vent glasses even though they're fixed and don't actually vent anything. That divider should unbolt and come out, either by itself, or, with its glass and/or door glass.
cuda
Now it makes sense. Looks like I have a little more digging around. Perfect weather.

Thank you very much for your friendly help.

Jerry