Dimensions 4.25 x 3.56 x 1.12 InchesACDelco R44LTSM Spark Plug Fits 2004 Chevrolet Silverado 1500 5.10 x 4.30 x 2.10 InchesACDelco 19307137 Specialty Rapidfire Spark Plug, Pack of 1 Fits select: 1999-201...