Paul, when retiring I worked delivering parts, part time, for a local parts house. It seemed everyone picked me to do the research for radiators for their rat rods, customs, dune buggys and such. Most parts houses have a catalog of radiators listing all the dimensions and capacity. I'd suggest going to the COMMERCIAL parts person, usually at the back, or at the end of the other counters, and take the time to turn through the pages. I'd also think doing this will be more economical than the restorations shops are the specialty vendors.
...let us know how you come out.
