This part (there are two) was in a box along with assorted nuts & bolts and this corner molding piece. It looks like it might fit behind the stainless corner trim piece. Any and all help appreciated. My car is a 72 Polara.
The first black parts are spacers that fit in the windshield channel below the windshield - one on each side There should already be mounting holes for them there.
The shiny parts fit on either end of the lower wide trim band the hides the lower windshield channel. They slide onto either end. There are mounting holes in the cowl for them as well.