One of our goals was to have air chucks mounted on each side of the truck so we had easy access to air from either side of the vehicle. After setting the Pro HD Series toolbox in the truck's bed, we found that there was about 2 inches of space between the bedrail and the side of the toolbox. Jim Cryer at Attitude Performance fabbed up a pair of "L" brackets, which mount to each side of the toolbox and hold the air chucks. Here you can see the finished bracket. It simply has a hole for mounting and another for the air-chuck assembly.