TWC0009 is a charge air cooler for Western Star trucks.
The core measures 36.5375" high by 26.375" wide, 1.9375" deep. It has a 0" inlet and a 0" outlet. There is no integral oil cooler and no filler neck.
It replaces 3 OEM and aftermarket numbers, among them WES18207, WES18207N, 222414. Searching any one of them will find this part.
On charge air coolers the inlet and outlet positions and the boot diameters matter as much as the core. A cooler that fits the opening but presents its connections on the wrong side will not plumb up.