'67 Valiant 2 door sedan - Rear glass gasket cross section or source of replacement

Howdy folks, I'm looking for a rear window gasket for my '67 Valiant 2 door sedan. The rear glass is not the same as a Dart, or a hardtop model. I've tried all the usual suspects, Auto City, Just Mopar, Laytons, etc.. no luck. If I could come up with a dimensioned cross section, I might be able to find something that would work at Steele... Anyone have any insight on the best way to proceed?
The image below was snipped from the shop manual, but I'm not sure it's for the Valiant. And, there are no dimensions.
Rear glass seal shape NN276.JPG