V-Twin 49-0878 18mm Doering Spark Plug Set

• Large hex original design for air cooled engines, #3 heat range terminal nuts and seal washers included
• Includes top ventilated brass collars for cooling, as original, Doering design!
• Terminal nut is not removable
• Plug set has a round feeler gauge
• Spark plugs have a 18mm thread and the large hex measures 1-3/8", which is perfect for early restoration and riding
• Set is for use with 1924 Harley models that require 7/8" thread spark plug. *NOTE: Sold as a pair. *NOTE: Fits early Knuckleheads, that can accept the 1-3/8" large hex. *NOTE: Air cooled spark plug set
• a nickel plated full size hex
• Full size hex is for single and twin flat heads, For IOE types, with space for the large hex

Not sure it fits your bike? Send us your make, model and year before you order and we'll check.