never saw anything like that in over 60 + years of playing with cars, owning a junkyard, and reading almost every car magazine dating back to the original 1948 hot rod issues.
it almost looks like a simple, home fabricated item, but it could have been mass produced by someone and sold through a performance dealership or a speed shop chain.
this item also shows i learn something new every day if i pay attention. my only problem with that is, at my age, i have trouble retaining what i learn unless i really go over it countless times like one would be preparing for a test back in high school.......