Long ago shops had parts in stock simply due to high volume repairs. The body shop I worked in years ago had an attached radiator shop. What happened to your radiator is anyone's guess. If you have a particular requirement, I'd suggest calling Glen-Ray Radiator. He's done work for me and he is quite knowledgeable. He also has NOS Harrison 3 and 4 rows, coolers and used tanks in stock. Easier to call him for all he has to offer.
I now save every tank from cars I scrap; too bad I did not do so long ago when we took all these cars for granted. Now I just have my own radiators made.