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Marine Spark Plug Wire Set for Mercruiser V8 Thunderbolt or Delco EST Replaces 84-816608Q61Marine Spark Plug Wire Set for Mercruiser V8 Thunderbolt Replaces Mercruiser 84-816608Q61. Fits all small block (5.0-5.7L) and big block (7.4)L engines with Thunderbolt ignition except for the 454 Hi Performance. Also will fit Delco EST V8 systems! 8mm premium wires with stainless steel core. Wire c...$41.95$41.95
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Sierra International 18-8804-1 Wiring Plug SetOEM: MERCURY MARINE 84-813720A2, 84-813720A3, 84-813720A4, 84-816608Q61, 84-816761A4, 84-816761Q3$37.38$37.38