Side Door Window Help

When the body shop placed a new door skin on my 73 Challenger, they lost some of the parts for the windows, and have gone out of business (naturally). We were able to get the passenger door window in through trial and error, but the drivers door is missing the window "guide and support, and gasket", the flat basically 4"x5" (or so) flat piece that goes at the back of the window and is attached by a plastic piece through the window. Anyone have one?
Challenger Window Pics 3.JPG
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Side Door Window Help
Author: BuckeyeCuda