Originally Posted by ED9man
So I need to buy new inners and have them welded in?
It figures that those plastic panels are the only ones I never pulled out and looked behind.

h:
I want a clean chassis.

Yep. I had mine cutoff and then inspected, and they were saveable (the outers). It just spreads like cancer.
New outers are $700 a pop for each side, inners probably run you $400 (Civic anyway) a side, they have to be welded in, and are labor intensive.
The outers are usually always saveable unless you have a rothole a 5-year old child can crawl through.