Denso (5394) IXG24 Iridium Power Spark Plug, (Pack of 1) 0.4mm Iridium Center Electrode Tapered Cut U-groove Ground Electrode DENSO (5394) IXG24 Iridium Spark Plug, Pack of 1 DENSO (5394) IXG24 Iridium Spark Plug, Pack of 1 DENSO (5394) IXG24 Iridium Spark Plug, Pack of 1