This 100% bolt on parallel 4-link system fits 99 to current full size GM 1500 series pickups. When used with the Cantilever bag bracket system, BOC-03, this rear kit is engineered to deliver superior ride quality and is versatile enough to lay you out on up to 22 inch wheels and give you about 12 inches of lift over the axle. It requires no gas tank relocation and installs in just a few hours. The kit comes with all necessary bushings, grade 8 hardware and a complete set of installation instructions. Panhard bar sold separately.