OEM PART NUMBER: 15815961. THE NEW IGNITION LOCK CYLINDER FOR MANY CHEVY TRUCK, GMC TRUCK, AND OTHER VEHICLES. WHAT YOU SEE IS WHAT YOU WILL BE GETTING. 2004 Chevrolet Silverado 1500 Base, Hybrid, LS, LT, SS, WT, Z71 4.3L V6 - Gas, 4.8L V8 - Gas, 5.3L V8 - Electric/Gas, 5.3L V8 - Flex, 5.3L V8 - Gas, 6.0L V8 - Gas.