Federal-Mogul Spark Plug - Copper Plus set of 6 941-1 | eBay
L77JC4 Champion Spark Plug 821M EACH - Primeau's Marine and Small Engines Plus
Amazon.com: Champion L77JC4 Pack of 4 Spark Plugs : Automotive
NOS Champion Marine Spark Plugs L77J4 49837 for sale online | eBay
Johnson 0384771 - SPARK PLUG, Ch ul-77v, 140 HP. Alternate plugs for susstained slow operation:Champion L77J4 Part number 386941or AC M40FFX ,Part number 38639. | Boats.net