I have a set of these fog lights on the shelf in my garage for about 5 years now. I even have both 6 and 12 volt bulbs (sealed beams) for them. They were made by Unity and have the same fastening device as illustrated in post #2. They have the Ford script on the shell as well. I realize that the sealed beams and yellow lenses came out several years after my truck did, but then so did I. I'll get around to putting them on one of these days, as soon as I get some other things done. Still looking for a "period correct" switch to make them work, nothing has caught my fancy yet. I did find some little skinny stainless conduit (like the horn & headlights only made for one wire) also.
Just more bling.