AFAIK, you can only get the new sets. Except for NOS stuff somebody may have stashed away, the old style cable sets are long gone. FWIW, the cables for the new and old styles are exactly the same, the only difference is the new cables have a slightly smaller diameter derailleur housing.

Like .4mm smaller.

Really.

So new cable sets are backwards compatible. See for yourself: http://www.campagnolo.com/jsp/en/doc/doccatid_3.jsp

And, they're supposed to be a little smoother. We'll see...