This isn't the greatest picture, but the intercooler-radiator combo is from an Isuzu NPR. This one is was used with a 175hp 4-cylinder turbodiesel.
The core measures 19.75 x 14.5 x 2. The input & output openings have an ID of 2-5/8. It was made by Tokyo Radiator.
I purchased the intercooler & radiator as a set so I could get the mounting frame.