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Amazon.com: NGK Spark Plug BP6ES 7811 (Pack of 8) Wrench size 20.8 mm Thread diameter 14.0 mm Thread Length 19.0 mm Spark gap 0.9 mm : Automotive
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Amazon.com: NGK Spark Plug BP6ES 7811 (Pack of 4) Wrench size 20.8 mm Thread diameter 14.0 mm Thread Length 19.0 mm Spark gap 0.9 mm : Automotive
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