Interchanging BB nds cups

AshtanoJoe

Dirt Disciple
I have a Shimano UN-51 BB in 113mm x 68mm, but I've lost the adjustable (NDS) cup for it. Are these cups interchangeable with other similar BBs? The original cup was steel, I might be able to find a spare plastic one off an old shimano BB. What are the chances one from another BB will fit?
AnJ.
 
Should be OK but 100% chance of perfect fit is a tad optimistic, metal cups are often thinner walled than plastic which means plastic might not fit that model. Only way is to try and see ;)
 
Far from 100% in my experience, even with same brand. Needs to be snug, not loose or super tight, hope this helps!
 
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