Jerry, I think you could find similar cable at a home improvement store such as Home Depot or Lowes. Just look for some that's the same or larger diameter and I'd buy stainless steel if available. It should not hurt if the cable is thicker, but it would be weaker if thinner. As far as the clip goes, it's just a common spring clip that you can also find at home improvement stores or hardware stores. Really, any kind of clip you can find that works would be fine.
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew