TKC0012 is a charge air cooler for Kenworth trucks, model years 1995 to 2012.
The core measures 34.875" high by 23.8125" wide, 2.25" deep. It has a 4" inlet and a 4" outlet.
It replaces 40 OEM and aftermarket numbers, among them CAC111B, 4861300002, 4861305002. 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.