Take the other two pieces center and tack them running with the cab.
Build your own headache rack plans.
Using the tape measure measure the distance from the outside of the top of the bed rails from the passenger.
Measure the top of the cab of your truck with the tape measure to determine how wide you want the rack to be.
Tack the end pieces on to run with the bed flush to the front of the rack.
Drill your hole in both rack bases and bed to line up and bolt.
Measure the distance from the bed rail to the top of.