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It should show in the AIM or Parts and Accessories Catalog for the 1980.
If you look at some vendors websites and look up the components connected to the bracket, the diagram may reference the brackets they connect to.
Check Corvette Central and Top Flight Automotive.
I thought those were spot welded onto the transmission housing. It is on my 79. I realize mine is a different year, and maybe they changed over to a bolt on one in 80. I've never seen one for sale. If you find someone on the forum parting out a car, maybe they can drill the spot welds out and sell you the bracket. You could probably bolt it in from there. I hope you find one.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.