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Here are a couple of threads on 72Freaks dually. Ryan is correct, no frame mods required with the C-30 Chassis. Basically all you have to do is widen the tubs and install front bed mount brackets on the frame for the Longhorn bed...
http://67-72chevytrucks.com/vboard/s...d.php?t=260748
http://67-72chevytrucks.com/vboard/s...d.php?t=307114
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