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6 Spark Plugs Autolite Iridium USA fits: Cadillac CTS V6 2.8L 2005-2007 Cadillac CTS V6 3.0L 2010-2014 Cadillac CTS V6 3.6L 2004-2015 OEM: 12590701, 12598004, 12611882, 12620540, 12625058, 12625661 (GM)