I can't remember just what was bolted to them, but in some cases it was the alternator charge wire when the battery was on the other side. But on the Explorers I'm not sure if that was the case or not. Seem to remember them being on the passenger side along with the alternator, so those would not have been needed for that.
I know what I use them for however. I clamp the power steering pressure hose to them as it routes over the top then down under out of harm's way until it reaches the box. A couple of simple clamps on the studs to hold the hose and you're good.
Other than those two items though, I can't remember what all I've seen connected to them.
Paul