Yeah, you don't need pics. If it's 1/8th inch metal, it's the skid. If it's about 1/25 inch plastic, it's the brush guard. But visually, they pretty much look the same.
I've seen the skids in junk yards several times. Problem is, on a WJ, you've got to drop the fuel tank to get the skid off, then drop your own fuel tank to get the skid on.