Premium Delco EST 4Cyl Spark Plug Wire Set by SierraFor Mercruiser 3.0LX 4 cylinder engines with Delco EST ignition systems. Kit includes coil wire.; Kevlar core for maximum durability and long life.; Durable stainless steel wound conductor for maximum horsepower and engine performance.; Premium silicone jacketing and boots for the ultimate in high temperature protection.; Superior RFI suppression for the most sensitive electronic system.; Corrosion resistant stainless steel spark plug and distributor terminals for maximum conductivity.; Replaces: Mercruiser; 84-816761K14, 84-816761Q14, 84-816761A14; Mallory; 9-28056;