SSBC-USA Tri-Power Direct Fit Rear Caliper Upgrade Kit 1999-06 GM 2500/3500. Fits: 1992 - 2000 Chevy/GMC 6.5L Detroit Diesel; 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.