1965 Dodge Dart Charger

65 Dartman said

They are a separate piece sandwiched between the bumper and the plate welded to the LCA. I'll post some pics later.

EDIT: And here are the pics:

Click to expand...

I have three guesses as to why they were used.

1. They're a reinforcement for the LCA at the bumper mounting point.

2. Somebody (chassis engineering?) determined that the bumper was ineffective in cushioning a full suspension compression motion and it was quicker to shim it up than it was to retool to make a taller bumper.

3. The plates may have been a field-trial type part with the L.A. plant chosen as the assembly plant to install them.