The BackRack low-profile drill hardware kit for select 1999–2016 Super Duty trucks is a 21-inch install kit that requires drilling two holes through the top of the bed rail. It lets you mount a toolbox at bed-rail height and uses four carriage-head bolts to secure the assembly while reusing existing toolbox clamps. Not compatible with tonneau cover adapter brackets; intended for low-profile toolbox placement.
BackRack 99-16 Superduty Steel Body Only Low Profile 21in Drill Hardware Kit