Originally Posted by dynaryder

The thicker cables like that are generally intended to be used on wheels and accessories. Depends on your saddle and it's positioning as to whether or not it can fit through the rails.

The orange sleeves are just to protect paint from being scratched by the swedge;if you cut it off,it may give you a little extra clearance. Otherwise you might have to just go with a thinner cable. Some hardware stores will make cables like that,you could have them make you a whole new custom one or just a loop through your rails to run that cable through.

You could also do away with using a cable for your saddle by rubber cementing a BB into the head of the hex bolt that holds your saddle on.