Hellwig BIG WIG Rear Anti-Sway Bars 01-23 GM 6.6L Duramax 2500/3500HD. Fits: 2001 - 2004 Chevy/GMC 6.6L LB7 Duramax; 2004.5 - 2005 Chevy/GMC 6.6L LLY Duramax; 2006 - 2007 Chevy/GMC 6.6L LLY & LBZ Duramax; 2007.5 - 2010 Chevy/GMC 6.6L LMM Duramax; 2011 - 2016 Chevy/GMC 6.6L LML Duramax; 2017 - 2019 Chevy/GMC 6.6L L5P Duramax; 2020 - 2025 Chevy/GMC 6.6L L5P Duramax.