OE Number - 12558178, BTR73450, 12617944, 12612350, 12630223, 12633904, 12637683,12585673,12639249, 89060436,12551933, 12611384, 12558177, 12622033. Our rigorously tested, state-of-the-art manufacturing process results in fully OEM-specified fittings that are easy to install. Advanced manufacturing techniques ensure durability and optimal operation at higher or lower temperatures, saving you money and time Fitment - The head gasket kit is compatible with 1999-2000 2002-2006 2008 Chevy Silverado 1500 4.8L, 2003-2009 Silverado 2500 HD 6.0L, 2006 2008 Silverado 1500 5.3L, 2002 2006-2007 GMC Sierra 2500 HD 6.0L, 2001 2005 Sierra 1500 4.8L, 2007 Express 3500 6.0L, 2000 Sierra 2500 6.0L, 2004-2006 2008 Silverado 1500 6.0L, 2002 Silverado 2500 6.0L, 2004 Silverado 3500 6.0L, 2003 Silverado 2500, 2004 Sierra 2500, 2010 Silverado 3500 HD 6.0L, 2007 Express 3500 4.8L, 2003 Suburban 2500 6.0L, 2005 Sierra 1500 6.0L Package Include - The engine gasket set includes: 1 x Gen III Valley Cover Gasket, 2 x LS1/LS2/LS3 Head Gasket, 1 x LS Oil Pan Gasket, 2 x LS Water Pump Gasket, 1 x LS Front Cover Gasket, 2 x LS Valve Cover Gasket, 1 x LS Damper Seal, 1 x LS Rear Cover Gasket, 1 x Rear Main Seal, 4 x Gaskets, 1 x Oil Filter Adapter Gasket, 2 x Knock Sensor Grommet, 2 x Multi-Layer Steel Head Gaskets for LS9 engines Superior Quality - Our engine cylinder head gasket is made of multi-layer stainless steel + graphite composite material, which can withstand 400℃ high temperature and 15bar high pressure. Excellent resistance to high temperature, high pressure, and corrosion, ensures maximum compression ratio allowing the engine to maintain an excellent seal for a longer period of time Save Time & Money - The set includes all necessary components for repair, no need to purchase separate parts, avoiding delays in repair due to missing items. The combined price of the set saves 15%-20% compared to buying all components separately. At the same time, it avoids compatibility risks caused by mixing parts of different brands, making it a cost-effective choice for both DIY car owners and repair shops KAX GEN 3 III LS Gasket Kit & LS9 Head Gaskets Set Fit for Chevy Silverado 1500 2500 3500 HD/Express/Suburban 1999-2010, GMC Sierra 1500 2500 HD, 4.8L 5.3L 6.0L, LS1 LS6 LQ4 LQ9, OE#12558178 12611384