Feature●New distributor cap, rotor, and spark plug wires for Mercruiser V6 engines with Thunderbolt ignition.●Fits4.3 L V6 engines with Thunderbolt ignition system.●8mm plug wires replace 18-8810-1, 9-28016, 84-816761Q16, 84-816761K16●Distributor cap is has quality brass/copper contacts. Includes new bolts, gasket, and drain for cap.●cap replaces Mercruiser #s , 815407Q5, 815407A2, 18-5274Description