I would call those "guards" since they're metal. I'd call the plastic ones "covers", but that's just me. I didn't know the guards were so hard to find until recently. i saw a set on Craigslist a while back but didn't see the need at the time. I found a pair of the plastic ones at a u-pull for under 5 bucks, and figured they'd be better than nothing.
A forum community dedicated to Jeep Grand Cherokee owners and enthusiasts. Come join the North American Grand Cherokee Association and participate in discussions about performance, modifications, classifieds, off roading, trail reports, troubleshooting, maintenance, and more!