Spark Plug E3 E3.38 copper M10x1, wrench width 16mm long thread similar to BOSCH UR2CC/ CHAMPION G57C/G59C/ NGK CR7E/CR8E/CR9E DiamondFIRE | SIP-Scootershop
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E3 Spark Plugs Spark Plug E3.72(4-PACK); Premium DiamondFire Automotive 18mm .430" Tapered Resistor | Star / PerformanceParts.com
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