TIR0065 is a radiator for the International 1600, S2100, model years 1979 to 1985.
The core measures 31" high by 25.8125" wide, 1.75" deep.
It replaces 41 OEM and aftermarket numbers, among them 1001395, 1A017918000, 1A17918. Searching any one of them will find this part.
On radiators the inlet and outlet positions, and whether the unit carries an oil cooler, decide interchangeability more often than core size does. Two radiators with identical cores are frequently not interchangeable.