I don't believe that the steel cabinets are still made or that Youngstown is still in business. At the same time, hinges are hinges, pretty much. If these are the long hinges, you can get steel music wire at many hobby shops. This is available in many thicknesses in 3 foot long sections and they will need a sample or accurate measurement of the old one. You can check for other hinge pins but you may have to buy the whole hinge at your home center. Another source is architectural salvage dealers. Many of these are on the web, if you search. Again, you may have to buy the whole hinge.