According to Specialized that seat post works with all saddle rails, including their oversized, oval CF rails. Those rails are 7x9mm, while the Kit Carbonio's rails are 7x9.6mm. Given all that, it sounds like that saddle would work with that seat post. I'd call Specialized, though, to double check. People have been known to do some light sanding on the grooves in the bottom half of such a seat post clamp in order to fit troublesome saddle rails. I've seen as much discussed at the Weight Weenies forum.