Feature●New distributor cap, rotor, spark plug wires and six AC Delco MR43T spark plugs for Mercruiser V6 engines with Thunderbolt ignition 1996 and older with non-vortec engine.●Fits 4.3 L V6 engines with Thunderbolt ignition system. Check MR43T are the correct spark plugs for your engine before ordering.●8mm plug wires●Distributor cap is J1171 certified and has quality copper contacts. Includes new bolts, gasket, and drain for cap. Dialectic grease included for wires.●Replaces Mercruiser #s 84-816761Q16, 815407Q5Description