72 Dart 4-Door Windshield Gaskets

Hey Guys -
I just figured out that I have a slight leak in my trunk, and it's coming in around the rear windshield. I talked to a very capable guy locally that does a lot of custom stuff, and he said I needed to get the windshield gasket before he would take it out to take care of it.
I need to find new gaskets for the front and rear windshields.

The leak is very small right now, and I want to take care of it before it starts rotting underneath the window like so many.

Thanks!