Heavy Duty Steel Tube Aluminum Air Fin Fuel Cooler for Kenworth and fits 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 & Peterbilt Trucks with Paccar Engine. Core (Finned area) Dimensions: 25-1/8” x 3” x 1-3/4” Replaces oem part numbers: N4153001 Notes: Robust steel tubes with aluminum fin construction Staggered tube pattern and high performance air fin design to maximize cooling. 100% leak tested from the factory. Guaranteed fit and function.