The little squares are defroster ducts for the side windows; most all cars have them in one shape or another.By now you've seen the released interior email and picture. So what are the squares below the speakers for? And what kind of radio is that?? No presets??? Might have to upgrade after all.....
It's supposed to defrost the front half of the window so you can see the side mirrors.
While you're measuring, can you get me the diameter of the Elgin "circles" please?