Installed my coil sprig spacers over the weekend and thay are great. I only wanted a small amount of lift and a fellow TDR member sugested these. Superlift 4520 thay are 3/4 inch spring spacers thay do reqire some light wellding. But all in all I installed them and new bilstein shocks it took about two and half hours. Note thay only come one spacer per pakage must order two to lift the front of the truck.