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SparkPlugs.com: RN12YC $2.99 Champion 404 Spark Plug - Best Car SparkPlug Replacement
Champion Copper Plus 404 Spark Plug (Carton of 1): Automotive - Amazon.com
4 Champion Spark Plugs RC12LYC Stock # 412 for sale online | eBay
NGK Catalogue 2017/18 by Apico - issuu
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Champion Copper Plus Plug Number RN12YC Spark Plug 404 | O'Reilly Auto
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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
Bikers won't fit anything else - Ekon
Amazon.com: Champion Copper Plus 404 Spark Plug (Carton of 1): Automotive
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8 Plugs of Champion Copper Plus Spark Plugs RN12YC/404 | eBay
Briggs & Stratton 5/8-in 4-cycle Engine Spark Plug in the Small Engine Replacement Parts department at Lowes.com