Quicksilver 8134214 | NGK R5673-8 Spark Plugs (Qty 4)Made of premium materials and validated for marine use, these Quicksilver Spark Plugs help keep high-performing Mercury Racing 575 SCi engines operating at their peak. Includes four replacement spark plugs that fit engines requiring G-NGK R5673-8.Key Product Features Fits Mercury Racing 575 SCi engines with serial No. 0L306696-0L307026, 0L601000-0L602090, 0M05000-0M5329) and (0M90000-0M950526) requiring NGK R5673-8 spark plugs.; Constructed for long life and optimum performance; Trivalent metal plating provides superior anti-corrosion and anti-seizing properties; Pure alumina silicate ceramic insulator provides superior strength and heat transfer; Copper core aids in heat removal; Includes four spark plugs; Application Information:Fits Mercury Racing 575 SCi engines with serial No. 0L306696-0L307026, 0L601000-0L602090, 0M05000-0M5329) and (0M90000-0M950526) requiring NGK R5673-8 spark plugs.