did your old FD use a length of cable HOUSING? If so, I think you either have to use a new FD that can accommodate housing or you'll need a clamp-on guide that directs the bare cable over the BB shell, whether you use the other side (for the RD cable) or not is up to you, (you could even grind it off). I suppose you could fit a clamp-on stop on the seat tube below the FD, but never tried that (and you might have issues with interference of the bolt, etc.).