TWR0017 is a downflow radiator for the Western Star 4900, model years 2002 to 2007.
The core measures 36.875" high by 39.5" wide, 2.25" deep. It has a 2.5" inlet at the top right and a 0" outlet at the right or left. There is no integral oil cooler and no filler neck.
It replaces 27 OEM and aftermarket numbers, among them WES94, 0523148001, 1A19334. Searching any one of them will find this part.
On radiators the inlet and outlet positions, and whether the unit carries an oil cooler, decide interchangeability more often than core size does. Two radiators with identical cores are frequently not interchangeable.
