Exhaust Gas Recirculation EGR Cooler 904-121 904121 for Chevrolet Truck C4500 C5500 Kodiak Silverado 2500 HDR eplace Part Number: 904-121, 904121 Application:Fit for Chevrolet Truck:C4500 Kodiak: 2006, 2007C5500 Kodiak: 2006, 2007 Silverado 2500 HD Classic: 2007 Silverado 2500 HD: 2006 Silverado 3500 Classic: 2007 Silverado 3500: 2006 Fit for GMC Truck:C4500 Topkick: 2006, 2007C5500 Topkick: 2006, 2007 Sierra 2500 HD Classic: 2007 Sierra 2500 HD: 2006 Sierra 3500 Classic: 2007 Sierra 3500: 2006 Fit for Workhorse Models:LF72: 2006, 2007, 2008, 2009, 2010, 2011R26: 2009