As others mentioned, there's probably not an exact replacement for the clevis. Replacing the complete pushrod might be the best approach.
I have used the Great Planes wire pushrods quite a bit. The Dubro equivalent works just as well but I do not have that link handy. These are 36 inches long
http://www3.towerhobbies.com/cgi-bin...?&I=LXK059&P=0