American Cooling Solutions replacement Heavy Duty Steel Tube Aluminum Air Fin Power Steering Cooler replaces Kenworth and 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: C500 Our Part Number: 21550 Core (Finned area) Dimensions: 34-3/8” x 3” x 1-3/4” Replaces OEM Part Numbers: R1411001, N1411001 Notes: Robust steel tubes with aluminum fin construction Staggered tube pattern and high performance air fin design to maximize cooling.