I don't quite understand what you mean by drill a hole. Do I drill a hole to get to where the nut was and weld in a new nut then seal up the hole?

I am also confused by the bracket reference. I have never seen a bumper bracket welded to the frame on any Challenger I have had.

Do you have any pics to explain what you mean?

1970 Challenger Convertible soon to be T/A convertible

Contrary to the opinions of some, I am not dumber than I look.