B-Body fuel tank brace question

My 70 Super Bee had 1 little black block about 1 inch x 1 inch with a recessed hole in it screwed to the bottom of the brace where the side of the gas tank would be. The other side is gone but the hole is still there for it. Does anyone know if these are reproduced? are they even original? Looks like the aftermarket braces have a peice spotwelded on them that keeps the tank centered. Any info much appreciated.

hello,I have seen this on 70 b-body's ,I AM ALMOST SURE it is
factory,not sure if they repro them,but I ALSO would like to know.

I finally got the undercoating cleaned off of the one I have and found a Chrysler part number on it. 2811861 below that are the numbers 99201 and below that is 60-2 then the pentastar. I have strong hunch these are factory so now I am on the hunt for another one.