There are a number of options out there that may or may not offer the protection you need for your rocker panels.
I personally have purchased what I feel is the best, complete, and strongest protection, at a very good price. My ZJ wears ZJ Rocker Shields by XJ Armor Inc. (www.extremejeep.com/xjarmor.htm) This protection will keep the entire rocker from ever being damaged because of the complete side protection, as well as keeping the Jeep itself from being damaged, as will result from the poor mounts designed for other rocker protection on the market.
If anyone has more information or pictures, please contact josh@jeepzj.com
Jeep is a registered trademark, and is not associated with JeepZJ.com