Introduction Our custom designed under bed notch means that you can have more clearance than a regular c notch. You can have a lower drop & not have to cut your bed (bottom rail will have to be removed). Comes pre-welded for an easy installation. Also it has a left side & right side for your convenience. No need to drop the gas tank. Which saves a lot of time. Application Compatible for Chevy Silverado 1500 2007-2018 Compatible for GMC Sierra 1500 2007-2018 Specification Placement on Vehicle: Rear Average Install time: 4-6 hours. Included: Pair of raw weld in under bed notches Package Include: Pair of raw weld in under bed notche Feature Made out of 3/16” Material (same thickness as your trucks frame, thicker is over kill). Vehicle specific not a universal kit. Allows for 4" of extra travel. Note Not a Universal kit, specific left right side. Requires welding bed removal.A must for any drop more than 6" Note these will NOT fit Standaerd/ Single Cab...