Head Gasket: This is just the head gasket. If you need all of the gaskets for the upper half of the engine use a Head Set.
Cummins 6B 5.9L ISB (OE# 3945803 - 25mm) Cylinder Head Gasket
Item Number: 54174A
Manufacturer: Reliance
Reference No: 54174A
Cummins 6B, 6BT, 6BTA 5.9L (OE# 3959052) Oil Pan Gasket Set
Item Number: OS32139
Manufacturer: Reliance
Reference No: OS32139
Oil Pan Gasket Includes: 3902425, 3914383, 3911536, 3920773, 3959052