Can someone tell me what the part below is? About 2"x3", steel, rusty. and with a little bow in the middle. It was bagged with a bunch of bolts/nuts, also rusty. Appreciate your kind assistance.

.BTW, I have completed the first phase of my car's rebirth - the body is painted! I posted a picture in my thread in the Welcome section. I'm very pleased with the outcome.
REgards,
Bob T






