NGK C8HSA Spark Plug $4.99 Quantity discounts available QuantityPrice Quantity: -+ SKU: EE125 ABOUT THIS PRODUCT:NGK C8HSA Spark PlugAboutAboutNGK C8HSA spark plug. 10mm threads, 1/2" reach, 5/8" hex, gasket seat, non-resistor plug. Stock plug for use with Trevor Simpson GSR40 head kit.