"Can anyone confirm the current rubber seal is different than 40 years ago? I do not want any leaks or changes to original appearance."
I can confirm that the car I am working on had an old rubber seal that did not have the flap, but the new one from MBCC does have the flap. The old seal measured about 5mm wider (inside to outside edge). And the windscreen is a new one from MBCC, I don't know how much it varies in thickness, if at all. As I said in another thread, I am trying to figure out the corner fit issue with the aluminum molding - at this point I suspect it is bent to some degree or slightly different in shape, meaning the older ones as in this case where I am reusing it, may be different than a brand new one. Or as mentioned in the tech manual on this site, it takes several tries to find a new molding that's not bent to fit.