Hey, I did it with a B67! With SPRINGS! (nobody laughs at you when you pass them...) Besides, your butt covers the saddle if the saddle fits. No-one sees the ginormous saddle under your ginormous... um.... sitbones. ;)
Seriously, you will be much faster if the saddle fits.
If the B68 doesn't fit, send it back to Wallingford and trade for a B17 or something, nothing lost. Bill Laine owns Wallingford, he's a curmudgeon but absolutely a sweetie underneath. Call him if you have troubles that you can't get answers for here on TE.
There are so many of us riding on Brooks saddles that you can probably get your answers here anyway.
And only some of us are curmudgeons. :p

