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
Champion C4 Model A B Ford Vintage Antique Spark Plugs C-4 Nice Con | eBay
2-8pcs Torch Spark Plug E6c Candel For For B6hs/b6hsa For Champion 5933/l86cc Ignition System Auto Replacement Parts - Spark Plugs & Glow Plugs - AliExpress
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
Champion Spark Plug x reference list - General Discussion - Antique Automobile Club of America - Discussion Forums