Cogito, Re-reading this, I realized that you had said Vintage. I guess that I should have asked first if you were looking for an authentic vintage part. Or a part that would go on a vintage machine.
The Chinese made ones work fine. A serious Hand Crank sewer would probably disagree though. Vintage pieces are hard to find by themselves. On line auction and classified sites would be the best place to start your search. Estate sales and garage sales as well as resale shops have turned up gems too.
~Grant~