We have two shops in town (Green Bay) that still do radiators. The one that does the best work will also tell you not mess with something that works reasonably well. They are also a very old operation and work on a lot of the old stuff. I don't know if they do mail order. You may be stuck going to one of the parts places for one that looks original. Or you could find a used one that is in better shape than what you have and get it cleaned and sealed. The $600.00 price seems like a message that says we don't want the work to me.

1946 1-ton Panel
1952 1-ton Comml. W/Grain Body