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@Mc_Nebula
When you say too wide, do you mean (for instance) that the frame is meant for a 68, and you have a 73mm bb?
Either way, either find thread gauges and a vernier and measure, or use trial and error with this table:
http://www.sheldonbrown.com/bbsize.html#threading
Phil Wood (pricey though) makes a french threaded BB, as does Velo Orange if your budget is more restricted - http://www.velo-orange.com/grcrufrthbob.html
The alternative is a threadless bb, Velo Orange make one too. http://www.velo-orange.com/grcruthbobr.html People sometimes have trouble with these coming undone, a common trick, I am told is to put one or two wraps of PTFE plumbers tape on the threads before installing. I have no experience with the Velo Orange stuff, and other people make threadless BB's. Take a look around before you drop $50 + postage and customs on the VO one.
A.