Hole in inner fender in engine bay?

Agreed. Typically a spot to rust. If you open up that seam - chances are you will find more rusty gold. (You have to look at it that way or MoPars will drive you crazy Lol!)
Allways try to go 1” past what you see to cut out all the cancer. If you find more - go 1” more. Get rid of it now while apart.
Syleng1