The piece at the point of the arrow is rustier than it looks in the picture, primarily on the side you don't see. While I can find floor pans, I can't find the little support piece that hooks up to them underneath and that is attached to the tub.
I can't imagine I'm the first to experience rust on this part, and I'm hoping a small replacement panel of some kind exists out there without me having to fabricate something.
Is there the piece out there by itself? What is it called? Where can I find it?
Furthest view to give context:
Closer, so you can see that it is spot welded up to the front of the tub:
Underside view, where it links to the bottom of the floor pan: