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CHAMPION 71ECO QC12YCX (RC12YC) 5/8-in Small Engine Spark Plug in the Spark Plugs department at Lowes.com
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Early Spark Plug Reference Chart? - Technical - Antique Automobile Club of America - Discussion Forums
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File:Champion Spark Plugs, Toledo, Ohio. - DPLA - 56e6c37db07cb71eac3ca90ac0145924 (page 1).jpg - Wikipedia
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