Product details:

Order one.. Plug Type: L78V. Seat Type: Gasket. Hex Size (Inch): 0.813. Hex Size (MM): 20.65. Thread Size (Inch): 0.551. Thread Size (MM): 14. Thread Reach (Inch): 0.5. Gap (Inch): 0.063-0.068. Gap (MM): 1.6-1.73. Center Electrode Diameter (Inch): 0.1. Center Electrode Material: Nickel Copper Alloy. Ground Electrode Material: Nickel Copper Alloy. Classification: Champion Copper Plus. Resistor Plug: N