Do they get pop riveted to the body? Is that what the holes are for? What is the arrangement of the large metal washer and the square “fabric” type washer in relation to the bumper?
I didn’t take them off the car so, have no idea of the original arrangement.
I have seen photos of bolts exactly like those before that were labelled as bumper bolts. There are predrilled holes in the sheetmetal on either side of the bumper bolt openings that match the location of the holes in the flat plates. That is enough proof for me and I will be fabricating similar hardware for my 67.
and the padded thingie goes between body and bumper, with the washer and nut going behind the bumper bracket to snug it agains the thingie and squash it to the body?