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@Zigura
Yes, there's differences between bottom bracket diameters, e.g. an Italian bottom bracket is larger in diameter than a BSA/British one.
You probably have the wrong bottom bracket for frame. Check which BB the frame has (BSA or Italian probably) and get a corresponding bottom bracket for it.
More info at sheldon's:
http://www.sheldonbrown.com/gloss_bo-z.html#bottom