Great detective work to you all, you are technically correct.
My car is the white one.
The cutout for my left dash vent has been cut too low, hence the factory had to come up with a solution for the tab on the bottom right corner of the dash vent to locate.
They have fitted what appears to be a modified speed nut, which I am holding in the attached pic. If this piece isn’t fitted, my dash vent does not sit correctly to line up with the glovebox.
The speed nut has been fitted with a modified pop rivet through that hole from the back that one of you has identified as a screw hole. Unfortunately the modified pop rivet they utilised has broken, so I’m trying to work out what I can use so that it sits flush against the dash for the dash vent to sit on top of. I thought a pop rivet from the front might work, but it will protrude too far out. You can see the mark in the paint from the flat piece that poked through from the back to attach it.
It really just goes to prove our cars were hand built and that sometimes ingenuity was relied upon.
You can also notice the small hole to the left that holds the chrome trim of the lower padded dash trim is a lot closer to my vent than on Joes red car.
I’ve also attached a pic of the tab on the dash vent that slips over the factories handiwork.
Doug