I'd try "the usual suspects" list of used machinery dealers that advertise in HSM: Dave Sobel, Plaza Machinery, etc.
Or, try South Bend http://www.southbendlathe.com/ although, if they have the parts, they'll probably cost a small fortune. (If you do want to contact South Bend, a phone call is likely to work a lot better than e-mail.)
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Everybody is ignorant, only on different subjects. -- Will Rogers
Law of Logical Argument - Anything is possible if you don't know what you are talking about.