Mar 31, 2025 · Not really, but that is the only plug Sears sells as a substitute The RC12YC plug looks like it was designed for a gap of 0 035-0 040", while the RC12YX plug was clearly designed for the --- answers com auto-parts Is_the_RC12YC_the_same_as_the_RC12YX_spark_plugNot really, but that is the only plug Sears sells as a substitute The RC12YC plug looks like it was designed for a gap of 0 035-0 040", while the RC12YX plug was clearly designed for the