This set of 4 Splitfire SF2E6 spark plugs is a perfect fit for your Citation, Monza, Monte Carlo, Century or any other vehicle that requires a 14 mm thread diameter, 13/16 in hex size, and 12 V voltage spark plug. The multi-electrode configuration ensures better performance and fuel efficiency, while the vintage design adds a touch of nostalgia to your ride. These spark plugs are made of high-quality copper material and are compatible with various interchange part numbers including ASF52C7F6, R44TSX, RBL13Y6, and more. This is a performance part that is suitable for gasoline fuel type and has an installation depth of .460 in. The OE/OEM part number includes 8U2J12405MA and 19157991. Made in the United States, these spark plugs are a reliable choice for any car enthusiast. Get your hands on this NOS (new old stock) set of spark plugs today and elevate the ignition system of your vehicle!