AC Delco Bolt --. 2003 Silverado 1500 WT 4-Door, Extended Cab Pickup, Power Brake System, With Front Disc, With Rear Disc, 4WD, 143.5 in. Wheelbase, 7,200 Lbs Vacuum Power Brakes. 99 Silverado 1500 (submodel: Base, LS, LT) Power Brake System, With Front Disc, With Rear Disc, 7,200 Lbs Vacuum Power Brakes.
