Speaker placement?

the factory speaker grille for the door is about 5 inches square and only 1/4 in out from flush with the door panel. Their speaker mounted to it. Vibration from the speaker was isolated from the door this way but that grille wouldn't hold up the heavy magnet speakers that most want today. Heat, age, weight, warped the 67 OEM grilles I have.
I suppose these are the reasons for no reproductions. Even if they were molded from Lexan instead of ABS,many modern speakers might be too deep for the no vent window models.