In Reply To:
I don't think you can cut them. There's an aluminum sleeve in the end of them that's a reinforcement for the bar-end shifter clamps. If you cut this off, you can't attach the shifters (unless you go to the considerable hassle of cutting out this sleeve, then grinding the new ends so that you can reinsert and glue the sleeve).
For what it's worth, you can cut them off and simply place the shifters in the carbon bar. I wouldn't suggest it to anyone unless you like a lot of hassle though, but I made it work.