TKC0018 is a crossflow charge air cooler for Kenworth trucks.
The core measures 39.625" high by 21.5" 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 32 OEM and aftermarket numbers, among them KEN16508, KEN16508N, KEN16508R. 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.