Feature●New distributor cap, rotor, and spark plug wires for Mercruiser V8 engines with Thunderbolt ignition.●Fits 5.0, 5.7, 7.4, 8.2 engines with Thunderbolt ignition system.●8mm plug wires●Distributor cap is J1171 certified and has quality brass/copper contacts. Includes new bolts, gasket, and drain for cap. Dialectic grease included for wires.●Replaces Mercruiser #s 805759Q3 & 84-816608Q61Description