Sierra 18-8821-1 Spark Plug Wire Set

• replaces: Mercury Marine 84-813720A3
• replaces: Mercury Marine 84-813720Q4
• replaces: Mercury Marine 84-813720Q3
• replaces: Mercury Marine 84-816761Q4
• replaces: Mercury Marine 84-813720A4
• replaces: Mercury Marine 84-816761A4

Replaces OEM part # MERCURY MARINE 84-813720A3 MERCURY MARINE 84-813720A4 MERCURY MARINE 84-816761A4 MERCURY MARINE 84-816761Q17 MERCURY MARINE 84-816761Q3 MERCURY MARINE 84-816761Q4 MERCURY MARINE 84-816761Q4 MERCURY MARINE 84-813720Q3 MERCURY MARINE 84-813720Q4 MERCURY MARINE 84-813720A3 MERCURY MARINE 84-813720A4 MERCURY MARINE 84-816761A4 MERCURY MARINE 84-816761Q17 MERCURY MARINE 84-816761Q3 MERCURY MARINE 84-816761Q4 MERCURY MARINE 84-816761Q4 Fits Mercruiser small block V8 engines with Thunderbolt ignition. Merc 350 Mag SKI 8 Cyl/5.0L Alpha & Bravo Gen + Thunderbolt.