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Genuine OEM Ford Motorcraft Updated Spark Plug Set F150 5.4L 3 Valve* V8 SP-546 Oem Genuine Motorcraft Spark Plug SetSP-546X / SP546 (8)(FORMERLY SP-515)*PLEASE NOTE: IN OR ABOUT 2008 FORD CHANGED TO A MODEL 509 SPARK PLUG. IF YOU HAVE FACTORY COILS...