For my CB500, I have a Motion Pro tach cable and both throttle cables, and they fit fine. Same length as the originals. I did buy a Parts Unlimited clutch cable, though, which was overall a little longer than the stock cable. Not by much, maybe 1" or a little more. The total throw length of the cable was the same, so the cable worked fine. I didn't like the quality of the end as much as the stock or the motion pro cables though, I can't remember exactly why. I think the solid metal cylinder, the cable end itself, was a little smaller than the original.
Hope that helps.