69 Dart, what are these parts?

I got my trunk cleaned up (more or less) to fix holes, and found a pretty good size hole (green arrow) rusted in this thing. It's inside the trunk, driver side, just forward of the tail light (red arrow). There is another one on the passenger side. Is this something I can patch or does it need to be replaced? And does anyone know what it's called? I can see it in my FSM but if I need a new one, I don't know its name to order it. As info, I will be replacing the rear quarter and trunk drop-off, they are shot.



Then there are these things on the rear end (blue arrow). I have one on each side, directly below the tail lights. I think they do not belong there, can someone confirm this? When cleaning the trunk I noticed they are installed with sheet metal screws from the bottom side, which seems unlikely from the factory. I have a bad feeling they are something the PO did to monkey up something I am not going to be happy having to fix.

factory originals

The last photo is a painted over plastic filler piece

The 1st Pic are stiffiner brackets (probably wrong name) but it is also used to hold car jack on RHS. I'm sure someone dicing up a donor car could help you.

First picture are bumper braces. Second picture are bumper spacing pads. Yes screws hold them on.

Many thanks guys. I will source a new part for the rusted out bumper brace. And I would have lost a bet on the bumper spacer pads, it just doesn't look like factory work to me.

Yes I forgot the Bumper brackets bolt through them.