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@deleted
Instead of the ultegra BB acc. Sheldon you can use the 105 5500, or the DA 7700
Both available at ChainReaction for 17 or 35 GN.
I know this cos I was looking for the exact same thing yesterday....
I went 105.
ref:
http://www.sheldonbrown.com/bbsize.html#shimano
you are looking for a V1 spline.