I actually remember when these first came out; at least in the 70's and possibly late 60's. I also remember wondering if Ford was going to sue them, and believe there must have been at least some litigation begun. I say this because, again as I recollect, they weren't on the shelves very long. I think that, I too, have seen more at swap meets than I did "back in the day" (which may also be an indication that Ford at least got them, whomever "them" was, to stop selling parts packaged like these). Just my opinion.
Bob