ChampionIridiumPlugs.com: RA8HC Champion 810 Spark Plug - Best Car Spark Plug Replacement
810 by CHAMPION - Copper Plus™ Spark Plug - Small Engine
Champion® 810 RA8HC Copper Plus 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 Eco-Clean 5/8 in. RA8HC Small Engine Spark Plug 810ECO - The Home Depot
Copper Plus Small Engine Spark Plug 938M, Type QL78YC | West Marine
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