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If your C30 is a 133" wheelbase model a longhorn bed will fit on it. All you have to do is add the front bed mount brackets on the frame and widen the wheel tubs for the dual wheels.
Here are a couple of threads member "72freak" posted when he built his.
http://67-72chevytrucks.com/vboard/s...d.php?t=260748
http://67-72chevytrucks.com/vboard/s...d.php?t=307114
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