Can anyone identify this part?

[71GranCoupe]

Here is a picture of what I think are bumper support brackets, not not sure what year/application they might be. One shows a part# 3754219L and the other is # 3754218R Thanks for any help or thoughts.

[Chryco Psycho]

rear bumper brackets that sit along the frame rail .

[MoparCarGuy]

Are you working on a Cuda or a Challenger?
They do not look like Cuda rear bumper guard support brackets.

[71GranCoupe]

@MoparCarGuy

I believe they are from a 70-72 challenger, but the number on the part shown seems a little high for a 70.