97188721 OE High Pressure Fuel Injector Line, Cylinders 3 and 6
For 2001, 2002, 2003, 2004 GM 6.6L Duramax LB7
Cylinder number 3 is the second one back on the passenger side of the engine. Cylinder number 6 is the third one back on the drivers side of the engine. This line services both positions.