I am working with Tom Hanson at the CC on getting the door jamb data tag. They do make them in Germany at the German CC. I do not know which cars this was on, but I do know it probably should have been on mine. There are two holes where the rivets should be on my door jamb, and I did take a photo recently of a car with January 1969 production, clost to mine. This is NOT the firewall plate inside the engine bay, but the door jamb tag.
It would be nice if we had additional information on the firewall plate--such as a good enough photo, and which years it might have been on.