Autolite® 4164 Copper Spark Plug for V-Twins - Replacement for OEM# 6R12 - Fits 1986-Up Sportster (XL) and 1999-2017 Twin Cam Harley Models and All 1988-2008 Buell Models - MADE IN USA - Billet Proof Designs
Champion Copper Plus Spark Plug - RN12YC Harley Motorcycle - Dennis Kirk
Spark Champion RN12YC
2 Pack - 12mm Long Reach Champion® Spark Plugs for Twin Cam 88®, 96™, 103™, Sportster®, X-Wedge and S&S 4 1/8" Bore Engines | S&S Cycle
Neofactory : Champion Spark Plug RN12YC [001443]
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Champion® 404 RN12YC Copper Spark Plug for V-Twins - Replacement for OEM# 5R6A on 1984-2000 Evolution and 1975-1980 Shovelhead (1200cc) Harley Motors - MADE IN USA - Billet Proof Designs
SparkPlugs.com: RN12YC $3.16 Champion 404 Spark Plug - Best Car SparkPlug Replacement
Champion® 404 RN12YC Copper Spark Plug for V-Twins - Replacement for OEM# 5R6A on 1984-2000 Evolution and 1975-1980 Shovelhead (1200cc) Harley Motors - MADE IN USA - Billet Proof Designs
Spark Plugs,Champion Rn12Yc Sh 75/84 W/Elec Ign & Bt Evo 84/99 Hot Plug Rpls Hd5R6A 404 from K and G Cycles!