RC Industries Top Mount Tool Box Mounting Brackets For Bed Rail Install White RC003D Partner Fits Select Jeep Wrangler TJ Headache Rack Rear Ladder Rack Gull Wing Box Options:Hex Headache Rack Only Fits Select Jeep Wrangler TJ Model 13408 Hitch extensions are simply receiver tubes that insert into your trailer hitch to add a certain amount of clearance for your vehicle's bumper or spare tire mounted on the back The RC Industries RC003D mounting kit includes two heavy duty mounting brackets used to secure your top mount box to the bed rail of your truck These mounting brackets mount to the truck bed floor and to the back side of the top mount box