TKC0006 is a charge air cooler for Kenworth trucks, model years 1982 to 2010.
The core measures 28.25" high by 27.6875" wide, 2.25" deep. It has a 4" inlet and a 4" outlet.
It replaces 66 OEM and aftermarket numbers, among them CAC112B, 084Q6718700, 10117V9734. 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.