OMIX proudly offers high - quality replacement parts so that you can keep you part of the Jeep heritage on the road - parts that always meet or exceed manufacturers specs for quality you can trust. This replacement spark plug fits 78 - 79 CJ5 CJ7 models equipped with 3.8 4.2 - liter engines and 78 - 87 SJ models equipped with 4.2 5.9 and 6.6 - liter engines. Non - Resistor plug with copper core. Sold individually. Replaces OE 3231345