Heard a knocking noise coming from the rear passenger side and thought it was a broken rear spring or broken rear upper shock mounting bolt. Found nothing from looking from underneath but when I removed interior trim found fender area rusted through allowing the shock mount to move when shock responds to rough road. Is there a fix for this. What metal is left in this area is paper thin.

 

I have heard of this happening and IIRC they welded in new Sheetmetal/mount. Apparently Doorman makes a new one. I think this is the R side though so search for the side you need

https://www.rockauto.com/en/moreinfo.php?pk=7313700&cc=1443394&jsn=8