Quicksilver 300-8M0079202 Ignition Coil KitGenuine OEM ignition coil is engineered for GM V6 and V8 MerCruiser sterndrive and inboard engines with Thunderbolt IV and V ignition systems, ensuring efficient spark delivery and engine reliability.Features Meets Mercury Marine OEM standards for quality and fit; Compatible with GM Thunderbolt IV and V ignition systems; Designed for use in MerCruiser sterndrive and inboard engines; Provides consistent ignition performance to optimize engine operation; Interchangeable with Sierra Marine: 18-5438; CDI Electronics: E18-0008;