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NGK Ruthenium HX Spark Plug Box of 4, FR6AHX-S, for Porsche Carrera GT 2004-2005. Product info includes shell thread diameter 14mm, thread pitch 1.25mm, gasket seat type, 19mm (3/4") reach, 5/8" (16mm) hex size, solid terminal type, and .043" gap. Used or aftermarket car part listing for a spark plug box of 4.