Pandora's box! Any time you open up something, gotta be prepared to find stuff you don't like. Working on my door cards which have totted out. Going to replace the speakers at the same time since I find, without surprise, that since 1983 they too have gone to hell.

The photos shown here (drive.google.com/drive/folders/11ms_-Foek7Gn8OzAaif-QICbZry-6zbH?usp=sharing) are from my driver's side door.
They are about the same as seen at about 7 minutes into this video (www.youtube.com/watch?v=NZwgniXSxYM).

None on the passenger side but that door gets very little use in comparison and it is my theory that with my speakers attached up high near these points and only to the door card which literally hangs from the piece in the first photo, the action of the speaker moving inwards when the door is slammed closed repeatedly causes or at least contributes to this.

I have realized that hanging a speaker from the door card only is NOT ideal or even a good thing as it stresses the door card itself. So have been looking for something to easily allow me to attached the to the 4 pre-drilled holes which already exist on 4" centers around the speaker hole. I can only feel more strongly about this now.

Suggestions on what to do about these cracks? Thanks