Aluminum Bumper Brackets
The brackets I posted were for a Barracuda. The Barracuda uses 4 (2, 2 piece) brackets that are very heavy (along with 2 small tabs at the fender).
These were for the front. 1 bracket for each side (instead of the standard 2). This left 2 unused holes in the bumper that I filled with bumper bolts (so it looked normal).
The exact weight of the brackets was 1.74 ounces each.