Any fabrication shop in your area should be able to grind out th rust and repair that piece - depending upon how bad it is. Can you post up a picture of the rusted area? There are many forums members here that can tell you exactly how difficult or easy it would be from the images.
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91 YJ "Alice" 2.5L AX5 D30/35, Rock sliders, Monsta Daughter&Dad Project
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05 LJ Rubi "Ghost" 4.0L Auto NV241 Rock-Trac D44/44 lockers, 4" Currie Lift, 1" BL, 33s, hardtop