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Gasser radiator Ordnance part number 7521972, Federal Stock number 752-1972, Ordnance Stock number G742-7521972, Manufacturers part numbers MO-AD5109, MO-1A5109G, RC-486F2 or SD-913165. Totally different.
http://www.jatonkam35s.com/M35-NOS-NEW-RADIATOR.htm This is what the multi looks like. I am guessing they were out of the system before NSN's were used.