Designed for folding covers that sit on top of the trucks bed rails. 50XXX Series Kits include everything required for installation except the BACKRACK™ Frame. Unlike the previous 925XX Series, a separate Hardware Kit is not required for purchase. See Tonneau Compatibility Guide for complete cross references. Important Note: The 50XXX series will lift your BACKRACK™ Cab Guard up by two inches. BACKRACK™ recommends using the new 1502X series BACKRACK™ Cab Guard. 1502X Frames are two inches shorter than our standard Cab Guards. ( BACKRACK™ Style only ). Example: BACKRACK™ for 2016 Sierra would require 50120 + 15024.