Running Board Luggage holders

[Skrain]

I was at a local junk shop yesterday, and saw a pair of the clamp-on expanding scissor type running board luggage/cargo holders.
Just wondering...did Ford ever make them, or were they an aftermarket accessory?
Also, what might a pair of them in decent shape be worth?
These needed some T.L.C., and wire-brushing and paint, but they were basically intact, and still expanded and folded up quite easily.