For 2019-2021 Chevy GMC Silverado Sierra Truck Bed Storage Tool Box Right SideInstallation: Connect The Connection Bracket To The Side Mounting Bracket Fasten The Bracket To The Car Body With M8 Bolt And M8 Nuta And Make A Mark At Other Hole And Then Remove The Bracket And Drill Hole On The Mark Put The Rivet Nut Into The Hole And Faster The Bracket With Hand Nut Holder Fasten The Whole Bracket To The Car Body According To The Other Hold Put The Plastic Shaft Pin In Correct Position Put The Storage Box In Correct Position