Cup bearing problem

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If I am understanding this correctly, there may not be anything you can do.
 
If you have a ton of parts, look for one that might fit. I did the same kind of thing on a Raleigh 20, non folder. If I read your post right. Here in town we have a bike co-op and they have a bunch of sets.
 
Measure the steerstem on the fork; is it a 1 1/8" dia? Your frame neck is likely for cups that take a 1" fork steertube. Therein would lie your problem. If it is so, you would need to find some cups that fit the frame and alow you use of the bearings for a 1 1/8" c/w their races.
 

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