NGK Spark Plug Stock # 6578 Spark Plug - NGK Standard - 14 mm Thread - 0.749 in Reach - Gasket Seat - Stock Number 6578 - Resistor - Each

NGK Spark Plug Stock # 4696 Spark Plug - NGK Laser Iridium - 14 mm Thread - 0.749 in Reach - Gasket Seat - Stock Number 4696 - Resistor - Each

NGK Spark Plug Stock #3857 Spark Plug - NGK Racing - 14 mm Thread - 21.5 mm Reach - Gasket Seat - Stock Number 3857 - Resistor - Each

NGK Spark Plug Stock # 7839 Spark Plug - NGK Standard - 12 mm Thread - 0.749 in Reach - Gasket Seat - Stock Number 7839 - Resistor - Each

NGK Spark Plug Stock # 3678 Spark Plug - NGK Laser Iridium - 14 mm Thread - 0.749 in Reach - Gasket Seat - Stock Number 3678 - Resistor - Each