You can get the correct rear window seal and lockstrip for the 67 from Steele rubber. I just bought one for mine a month ago. I also bought the lockstrip for the front gasket from them but had to buy a used gasket from a fellow A-body member for the windshield as you are correct, no one makes the 67 one now. The old gasket was kind of hard and coated with sealer but after several hours of work it cleaned up and softened up using Castle Big E cleaner. Good luck.
Mike
