Where to have a custom-made radiator made

Dear Fellow Listers: Can anyone recommend a company, preferrably near New York City, to custom make a radiator for my "75 Urraco P250?Also, would any of you know if a radiator from a late 70s 308 would work, there"s one available for the nominal sum of $300 in a state neighboring mine? Regards, Orvin Aquart "75 Urraco P250