Whether you need one replacement up-pipe bolt because it broke or you need a full set, Precision Parts has you covered! We recommend installing a full set of bolts so you never have to worry about breaking a stock bolt again. These bolts secure the up-pipe to the exhaust manifold and turbo assembly, feature a black finish and have a 12 point head. These bolts are Grade 12.9 providing a substantial extra margin of safety over Grade 8 hardware. The stock bolts have tendency to break when reused, so skip the hassle and replace them when the up pipes are already out! Features: 12 pt head for more surface area to grip to reduce chance of stripping Black coating for corrosion resistance Grade 12.9 for additional strength Full set of 12 for both up pipes 1-Year Fitment: 2001-2004 GM 6.6L LB7 Duramax Diesel 2004.5-2005 GM 6.6L LLY Duramax Diesel 2006-2007 GM 6.6L LBZ Duramax Diesel 2007.5-2010 GM 6.6L LMM Duramax Diesel 2011-2016 GM 6.6L LML Duramax Diesel