I came across a salvage yard Oct '69 built Challenger base model that had a couple of thin spring steel flats (approx 5" l x 1.5" w) that apparently were installed in the corner or the front bumper to hold the rubber inserts in place. They mounted underneath one of the bumper bracket nuts. Has anyone else come across these? I'm thinking it was an early build thing that was dropped later in 70. I believe that they may have gone away when the factory started scalloping the V-slot they cut into the bumper wrap around for the rubber insert. Comments?