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My front inner fenders are in great shape, as are the fenders, however there is nothing protecting the inside of these from road "debris" i.e. paint, grease, gum, etc. I have been unable to find inner fender LINERS for our trucks. Assuming Ford never made them, but a little surprised no aftermarket exists either?
Back in the days before plastic inner fender liners, spray or roll on undercoating was used.
I think I saw my first plastic inner fenders in the mid 80’s.
That being said, I imagine you could get some plastic inners from a later model pickup, maybe in the 90’s, and modify it to fit. It wouldn’t be a perfect fit, but it would help keep water and mud from getting into the pockets in the fender wells.