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Tuning kit for Mercruiser 5.0, 5.7, 7.4, 8.2 engines with Thunderbolt ignition. Spark plugs are for Vortec engines from 1997 and newer. Kit includes spark plug cords, coil wire, distributor/router cover and 8 MR43LTS spark plugs Spark Plug Wire Replaces Part Number 84-816608Q61, 84816761K17, 84-816761Q17 Distributor/Rotor Cabinet Kit Replaces Part Numbers 805759Q3, 805759T3, 805759T1, 13524T1, 27-805760, 805759Q-3, 805759A5, 805759A 2, 16457A 4, 135599 75757 575757A 4, 1355555555555555557A 4, 1355555555555524T 1, 13524A 5, 13524A 1 8 x Delco MR43LTS AC Spark Plugs Please check the engine shell to make sure this is the correct spark plug for your engine before placing an order.