I replied to your other message re your car; good luck on it!
Since my cowl panel is off (since last week) when I saw your message i went down and took a couple of photos trying to get a pix of the screw head. Actually, all of the screws under my windshiield were the same, but some appeared to have blank head markings (or maybe 43 yrs of crud?)..
Anyway, I removed one and then searched in the AMK catalog to see if I could find a match. Attached are the photos I took. I think AMK number B-11085 is the same (but different head marking)..
The first photo is with the screw lying beside the B-11085 in the catalog; the second is the best pix I could take of the head marking.. appeared to be a circle...?