Fitment: for Buick 2004-2007 for Buick Rainier L6 4.2L for Chevrolet 2018-2020 for Chevrolet Express 2500 V6 4.3L 2018-2020 for Chevrolet Express 3500 V6 4.3L 2014-2021 for Chevrolet for Silverado 1500 V6 4.3L 2002-2002 for Chevrolet Trailblazer L6 4.2L 2003-2005 for Chevrolet Trailblazer L6 4.2L 2006-2009 for Chevrolet Trailblazer L6 4.2L 2002-2006 for Chevrolet Trailblazer EXT L6 4.2L for GMC 2002-2002 for GMC Envoy L6 4.2L 2003-2005 for GMC Envoy L6 4.2L 2006-2009 for GMC Envoy L6 4.2L 2002-2006 for GMC Envoy XL L6 4.2L 2004-2005 for GMC Envoy XUV L6 4.2L 2018-2020 for GMC Savana 2500 V6 4.3L 2018-2020 for GMC Savana 3500 V6 4.3L 2014-2021 for GMC Sierra 1500 V6 4.3L For for Isuzu 2003-2008 for Isuzu Ascender L6 4.2L for Oldsmobile 2002-2004 for Oldsmobile Bravada L6 4.2L for for Saab 2005-2009 for Saab 9-7x L6 4.2L Replace Part Number: 91418, ILTR5E11, 12598004, 12622441, 12625058, 3474 Product Advantage: Sark plug is to introduce the pulse high-voltage electricity generated by the ignition coil into the combustion chamber, and use the electric spark generated by the electrodes to ignite the mixture, thereby starting the engine. Iridium is a type of refined alloy highly suitable to be used as the materials of the central electrode in a spark plug. It ensures a more stable idle speed of the engine and faster starting up. Package Include: 6 Pcs Spark Plug