Lower Valance. (1) Front Bumper Lower Valance. 1999-2000 Chevrolet Silverado 2500 Base 8 Cyl 5.3L. 1999-2000 Chevrolet Silverado 2500 LS 8 Cyl 5.3L. 1999-2000 Chevrolet Silverado 2500 LT 8 Cyl 5.3L. 1999-2002 Chevrolet Silverado 1500 Base 8 Cyl 5.3L.