You will need to find an old timer who can refurbish the radiator you have. Or spend hours trying to find a close match and custom make the mounting brackets.
I feel your pain. I had the same freak out you must be having a few months ago.
Check with Jim Nape, of the old Powerclean Company. Not sure what his company is called today. He rebuilds and refurbishes older Genensis's and he builds his own line of TM's. I sold him 2 Genesis's, and I threw in an extra radiator I had. He may have one or he may have used them in other machines. I believe he works at Aramsco in Chicago.
Or search him on FB.