Not sure what this thing is (car newb) and I thought you guys would be the ones to ask. As you can tell there's a lot of rust in this quarter panel (needs complete re-weld) but this part underneath is "broken" whatever it is. The part on the right in the pic is bolted into the frame but it seems like the metal was pretty flimsy to begin with. Then again, I'm no expert, maybe the rust is why it feels so flimsy... Any idea what it is? I'm talking about the square-shaped end facing the camera and a longer part that seems like it connected to it.