Years ago when I still had a Pinto engine, probably around 1994, I bought some push-pull throttle cables from Control Cables. They were the best, most flexible and smooth-acting push-pull cables I've ever had.
Today, when installing my Zetec, I noticed the inner cable wire was in bad shape, but the sheath was OK, so I called them.
I asked if I could just replace the inner cable, and they agreed that would be possible. So for two 90"-long Teflon-wrapped 3" stroke ultra-light inner cables with one end plain and one end with 10-32 threads, it'll be around $50 total + shipping and they'll go out tomorrow.
It's nice to know that companies that really like to help their customers still exist.
www.controlcables.com