TFC0012 is a charge air cooler for the Freightliner Century Class, MT45, MT55, model years 2003 to 2006.
The core measures 24" high by 27.1875" wide, 2.25" deep. It has a 3.5" inlet and a 3.5" outlet.
It replaces 25 OEM and aftermarket numbers, among them CAC459, 1030257, 818966. 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.