TMR0023 is a downflow radiator for the Mack R Model, model years 1985 to 1993.
The core measures 43.25" high by 30.875" wide, 2.625" deep. It has a 2" inlet at the left and a 2.5" outlet at the left. The unit carries no integral oil cooler and a right filler neck.
It replaces 7 OEM and aftermarket numbers, among them 730063, 730063BT, MK7171. 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.
