Replacement Heavy Duty Steel Tube Aluminum Air Fin Power Steering Cooler replaces Peterbilt Trucks With Paccar Engine. Always reference your oem numbers prior to buying. Review all photos and dimensions as there may be more than one option for your year, make and model. Applications: Kenworth Truck Models: T680, T800 Peterbilt Truck Models: 367, 386 Our Part Number: 21546 Core (Finned area) Dimensions: 34-3/8” x 3” x 1-3/4” Replaces OEM Part Numbers: N4148001, EC3501, N3800003 Notes: Robust steel tubes with aluminum fin construction Staggered tube pattern and high performance air fin design to maximize cooling.