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John Deere Spark Plug (Champion RC12YC 70) - M143270
NGK BCPR5ES OHV Spark plug Equivalent To Briggs and Stratton number RC12YC
CHAMPION 71ECO QC12YCX (RC12YC) 5/8-in Small Engine Spark Plug in the Spark Plugs department at Lowes.com
Amazon.com: Omix-Ada Spark Plug Compares to Champion RC12YC : Automotive