Rust behind rear tire

As I move along with disassembly of my 82 308, I wonder why there is rust coming through in the same spot on both sides, right behind the rear tire

and I noticed there’s a small hole in the wheel well behind the rear tire, and I bet water is getting in there when the car was driven in the wet some years ago.

inside the rear trunk luggage area, after I took all of the pieces out, it seems the rust is where the two pieces of sheet metal come together. Rust in between it. Any suggestions on how to repair this area? Any idea why Ferrari would have a hole in the rear wheel well to allow water to get in here?


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