For XT's, I think that on the 68 shell you would put 2 spacers, on the 73 you would put one, but if you took out the one spacer, I think you'd still be short about 5mm. I dunno if Shimano makes XT's with a longer BB. You might want to think about saints or Race Face, or if you're stuck on the external bearings, Truvativ has the new ISIS bb that has external bearings called the Howitzer (kinda heavy).
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