Since no one has taken a stab at this as far as value, I will give it a shot.
I had one and sold it a few years back (IIRC, on this site) for $100.
Today, I believe a factory 13/16 bar is worth between $150 and $200.
I realize it MAY have come off a COPO car with the sports car option, but as Charley mentioned, pretty certain they also came on some Firebirds and a few Novas. Would be worth much more if the 1969 9737 COPO cars.
It is being reproduced:
https://www.ebay.com/itm/1967-69-Che...QAAOSwu7hbSNaU