Sierra 18-8810-1 MerCruiser Thunderbolt V6 Spark Plug Wire SetSierra replacement spark plug wire set for MerCruiser Stern Drives. For 6 cylinder engines with Thunderbolt ignition systems.Features: 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.; Cyl.: 6; Ignition Type: EST Electronic; Lead Lengths: 2 Spark Wires 25"; 2 Spark Wires 30"; 2 Spark Wires 35"; 1 Coil Wire 13"; Interchangeable with: CDI; 631-0013; Mallory; 9-28016; 9-28091; MerCruiser Stern Drive; 84-813720A11; 84-816761A16; 84-816761Q16; OMC Stern Drive; 0503751;