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The Rancho Suspension 4-inch lift kit is available for '99-'08 GM Duramax 2500s and 1500 and 2500 Silverados. Three different part numbers (RS6548, RS6549, RS6550) cover the GM field listed. Check their Web site, www.gorancho.com, for more info on your truck's lift kit. Rancho's #RS6548B and RS5000 nitrogen-filled shocks were also ordered for the '05 GM 2500 Duramax 4WD diesel installation shown here. The Rancho kits come powdercoated in red or black.