um, i'm running a truvative DH BB 68-73 and i just threw it on with out the spacer and it all just bolted together. had a perfect chain line and the chain guide lined up perfect aswell. maybe i was just lucky.
(side note, somehow i lost my "other" splined BB tool and i had to sell my PX to RED with the BB still in the frame, i hope i don't have to change Tashas BB anytime soon)