Wellman Glow Plugs 6.6L DURAMAX LB7 2001-2004 Diesel Fast Start (Set of 8) Chevy GMC 2500 3500 For the 2001-2004 LB7 Duramax engines. These plugs heat up 20% faster and get 100 deg. hotter than the original plugs 1 Year Warranty Set of 8