Seller notes

Product DescriptionSierra 18-8821-1 marine spark plug wire set. Ignition Type: Thunderbolt. Replaces: Mercury Marine 84-816761Q4, 84-816761Q3, 84-816761A17, 84-813720A4, 84-813720A3, 84-816761Q17, 84-816761A4. About Sierra Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty ...

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