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The BackRack low‑profile drill hardware kit for 2020–2023 Chevrolet and GMC 2500/3500 HD models provides a 21" mount solution that requires drilling two holes through the top rail to achieve a toolbox installed at bed‑rail height. Four carriage bolts secure the assembly and allow use of existing toolbox clamps to maintain a low profile. This option requires drilling and is not compatible with tonneau cover adapter brackets, so confirm your setup before ordering.
BackRack 20-23 Chevrolet/GMC Silverado/Sierra 2500/3500HD Low Profile Drill Hardware Kit - White
