Genuine Champion RJ19LM spark plugs. If you have the following Briggs & Stratton models. DoesNOT fit the following:122M02, 122M05, 122M07, 124T02, 124T05, 124T07, 124T12, 126M02, 126M05, 126M07, 126T02, 126T05, 126T07, 126T12, 128T02, 128T05, 12J902, 12J907.
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