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Tune up kit for Mercruiser 5.0, 5.7, 7.4, 8.2 engines with Thunderbolt ignitions. The spark plugs are for Vortec engines 1997 and newer. Kit includes spark plug wires, coil wire, distributor cap/rotor, and 8 MR43LTS spark plugs Spark plug wires replace part numbers 84-816608Q61, 84816761K17, 84-816761Q17 Distributor cap/rotor kit replaces part number 805759Q3, 805759T3, 805759T1, 13524T1, 27-805760, 805759Q-3, 805759A5, 805759A 2, 16457A 4, 13524T 1, 13524A 5, 13524A 1 Eight AC Delco MR43LTS spark plugs. Check your engine cover to ensure these are the correct spark plugs for your engine before ordering.