Caterpillar Cat C15 1326663 6NZ 9NZ 6NZ & 9NZ CROWN-LESS Skirts included Truck Applications IF6663/002 Kits 2 piece pistons: Liners, Liner O-Ring, Piston Skirt?s, Piston Pins, Piston Clips, Main Bearings, Rod Bearings, Thrust Washer, Upper Gasket Set & Oil Pan Gasket IPD Crevice Seal Cylinder Liner is available for purchase for this item.