Shock Mount Upper Rear fits 1999-2007 GMC Sierra & Compatible with Chevy Silverado with Round Tube X-members (excludes C/K series and 07 new body) Red Hound Auto Rear Shock Mount Bracket Fits either shock on rear axle of 99-06 Silverado 1500 / 99-06 Sierra 1500; Compatible with includes 2007 Classic body; excludes older C/K series Note: Only for 1500 1/2 ton trucks that have round tubular frame stiffening crossmember; not made for 2500/3500 TAKE NOTE: Ships flat; easily bent for installation; Laser cut and perforated Made from 11 Gauge Steel; manufactured using custom fit template, offering perfect angle alignment on cross member