I've already talked to the owner and checked it out, we're getting a prepurchase inspection at a local trustworthy mechanic. There's rust on the trunk lid, and a little bit of rust (no rot) on the front of the rear right wheel well, and then the front of the left rear wheel well has legit rust rot, I can pull pieces off with my finger.

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There's a pick n pull that I can drive to and grab a new trunk lid that isn't totally rusted out, but the left side rear wheel well is worrisome. should the mechanic tell me the underside frame isn't totally rusted out, I'm going to remove the rust from the offending areas, and then I want to buy some kind of aftermarket side skirt that will cover up the hole's left behind. I would need something that covers the the front of the wheel well, and possibly under the door? I'm not sure. any suggestions would be great.

https://preview.redd.it/ima3vhiro5l61.jpg?width=200&format=pjpg&auto=webp&s=58e2ac4a5e9ebfd89a47691649dafdaeb9c2c96e