NGK Spark Plug Stock # 3691 Spark Plug - NGK Iridium IX - 14 mm Thread - 0.708 in Reach - Tapered Seat - Stock Number 3691 - Resistor - Each

NGK Spark Plug Stock # 6681 Spark Plug - NGK Laser Iridium IX - 12 mm Thread - 0.749 in Reach - Gasket Seat - Stock Number 6681 - Resistor - Each

NGK Spark Plug Stock # 6668 Spark Plug - NGK V-Power - 14 mm Thread - 26.5 mm Reach - Gasket Seat - Stock Number 6668 - Resistor - Each

NGK Spark Plug Stock 4306 Spark Plug - NGK V-Power - 14 mm Thread - 0.985 in Reach - Tapered Seat - Stock Number 4306 - Resistor - Each

NGK Spark Plug Stock # 5574 Spark Plug - NGK Standard - 14 mm Thread - 0.370 in Reach - Gasket Seat - Stock Number 5574 - Non-Resistor - Each

NGK Spark Plug Stock # 6619 Spark Plug - NGK Iridium IX - 14 mm Thread - 26.5 mm Reach - Gasket Seat - Stock Number 6619 - Resistor - Each