Early A Dash Frame Installation "Doubt"

I just parked in the shade and shined a flashlight into the hole. There is no matching hole in the metal cowl beneath the dash frame, which makes it a blind hole and a hole without any threads.

If I am not mistaken, there is a kind of "mystery" color-coded rubbery strip that I have see photos of that the factory installed all along the bottom of the windshields (this piece seems to be always missing after thirty or forty or fifty years). Maybe that strip had some rubber "male" tabs that clicked in a couple of these holes to hold it in place?