Demco Hijacker Ums-Series Under Bed Mount Bracket Kit - '99-'10 Ado/Sierra Silver 8551004. Fits Chevrolet Silverado 2500 and 3500 HD (6 1/2 and 8; Boxes) 2001 - 2010 (Includes New Body Style) Chevrolet Silverado and Sierra 1500 / 2500 (6 1/2; and 8;...