Hmmmmm. You got me stumped on that one. I can't even find a diagram that shows that part for any 87' 4.2 liter six, even in my manual that includes the 87' model Wranglers.
I was talking to my dad (the original owner), and he said that he did take it in to get some kind of recall, but he doesn't remember exactly what all was involved. Perhaps all that was involved in what he had done was putting in the plastic piece with the orifice, and not removing the solenoid. Last night, I meant to check a plastic connection that I pulled out when I replaced the hoses, but I didn't get to it. The plastic piece connected the formed hose coming from the PCV valve to the straight hose that went to the solenoid. It may have the orifice in it, but since its clogged up with gunk, I'll have to clean it out to check. However, even if it does, a piece of it cracked off when I was pulling everything apart, so I'll probably need another one. I'll do like you said, check a local dealer to see if I can just pick it up there, otherwise, I'll probably be interested in your old one.
I noticed from your pictures that your rig has the aluminum valve cover.