TSC0003 is a charge air cooler for the Sterling LT9500, LT9511, model years 1999 to 2004.
The core measures 35.3125" high by 27.1875" wide, 2.25" deep. It has a 4.5" inlet and a 4" outlet.
It replaces 23 OEM and aftermarket numbers, among them CAC128D, 1030118, 1030138. 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.