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6 Spark Plugs Set Autolite Iridium USA fits: Chevrolet Trailblazer L6 4.2L 2002-2009 Chevrolet Trailblazer EXT L6 4.2L 2002-2006 OEM: 12590701, 12597464, 12598004, 12607280, 12611882, 12617309, 12620540, 12622561, 12625058, 12625661 (GM)