Outboard industry standard mounting rails are wider (48 in. ) for faster install, because the mounting points are outside the truck frame, allowing the installer to avoid under-bed components. Each kit contains a pair of Outboard Custom Quick-Install Brackets and a pair of Fifth Wheel Mounting Rails with a 10-bolt design. Hardware included. Grade 8 hardware, meets all Canadian requirements. SAE J2638 compliant. Includes a limited lifetime warranty. Reese's 56007-53 Kit fits: 2014-2019 Chevy Silverado/GMC Sierra 1500 LD (Old Body Style) (Does Not Fit MagneRide Magnetic Ride Suspension), 1999-2013 GMC Sierra 1500, 2001-2006 GMC Sierra 1500 HD, 2007 GMC Sierra 1500/1500 HD (Classic), 1999-2004 Chevy Silverado/GMC Sierra 2500, 2001-2010 Chevy Silverado/GMC Sierra 2500 HD, 2007 Chevy Silverado/GMC Sierra 2500 HD (Classic), 2001-2006 Chevy Silverado/GMC Sierra 3500, 2007 Chevy Silverado/GMC Sierra 3500 (Classic) and 2007-2010 Chevy Silverado/GMC Sierra 3500 HD.