Wish I had seen your post earlier. I only now browsed the forum, coincidentally just after a brand new set of headlight assemblies on my 1992 Explorer Sport, (aka Mazda Navajo). I ordered a brand new set from Rock Auto last Friday, and FedEx left them at my door on Tuesday. My originals were fogged and old, and new replacements were less than $30 each, including bulbs. I also see that they have brand new replacement grills for less than $28. Lots of parts for my Explorer on Rock Auto.
I used my old Haynes manual for instructions of how to replace the headlight assemblies, and it was about half accurate, but regardless, it wasn't too hard to change the headlight assembly.
I should have also bought the marker light assemblies and surround trim, since they're so cheap, and they are removed along with the headlight assembly anyway. I think the front side marker lenses were $3 and change each, and the trim frames (Rock Auto calls them headlight doors) were a little over $7 each.
Oddly, I couldn't find the front turn signal lenses though.
I just got back from driving around the block to see how well the new lights work. It's amazing how they light up the road now.