Banks Ram-Air® Rear Diff Cover | 01-19 GM | 03-18 Dodge/Ram | 14-Bolt AAM 11.5" or 11.8". Fits: 2001 - 2004 Chevy/GMC 6.6L LB7 Duramax; 2003 - 2004 Ram 5.9L Cummins; 2004.5 - 2005 Chevy/GMC 6.6L LLY Duramax; 2004.5 - 2007 Ram 5.9L Cummins; 2006 - 2007 Chevy/GMC 6.6L LLY & LBZ Duramax; 2007.5 - 2009 Ram 6.7L Cummins; 2007.5 - 2010 Chevy/GMC 6.6L LMM Duramax; 2010 - 2018 Ram 6.7L Cummins; 2011 - 2016 Chevy/GMC 6.6L LML Duramax; 2017 - 2019 Chevy/GMC 6.6L L5P Duramax.