Take your stock long bed floor, cut 12" off the front of the floor, and 8" off the rear, but take the aft 8" approx. 4" fwd. from the aft edge, because you will have to weld the rear cross member/ aft end of floor back to the remaning floor. That way you can save the end of the ribs.
See attached pic. Before welding, bolt the bed sides to the floor, then bolt the aft 4" peice to the bed sides (rear pillars)
(4 locations each side), that way you can make minor adjustments if needed. I hope this helps. It's hard to explain, but it is not that hard to do.
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