Take the other two pieces center and tack them running with the cab.
Build your own headache rack plans.
Measure the top of the cab of your truck with the tape measure to determine how wide you want the rack to be.
Drill your hole in both rack bases and bed to line up and bolt.
I ve wanted to do this since before i could even drive.
Cut your 1 1 2 inch 3 8 cm x 1 4 inch 0 6 cm flat strap into 4 x 6 inch pieces.
Tack the end pieces on to run with the bed flush to the front of the rack.