240 diesel radiators (both MT and AT) are very hard to come by from what I remember other members posting the last few years.
I don't believe any new replacements are available at all last time we heard. But the good news is, all 240 diesel rads were all-copper units that can be rebuilt at reasonable cost by any capable radiator shop.
Thus, that will probably be your best option. Try looking for a place that does work on industrial or agricultural equipment. There are a lot of machines out there still working hard every day in the world that need to be maintained, yet are hard to get parts for. Folks using those kinds of equipment often rely on good radiator shops to rebuild rads that they can no longer easily buy.
