It's going to be impossible to find a part advertising like this.
I would like to recommend the following for easier finds;
Section;
Classifieds, parts
"WTB, radiator for Dodge WC"
or something like that. With a title more specific to the part and vehicle, more people, people that actually have that part of know of one, will open your thread and look at it and help out if they can. Junkyard is to broad.
I hope this helps and wish you good fortune in finding the part. Nice truck, by the way.