Thanks Lee
It seems impossible to find an example
That does look like it could be it. Looks very bronze or copper in that picture and maybe some orange where the sun is hitting it. It's one of those colors that is hard to get a good read on.
When Corvette Bronze came out in 68 it was seen on other Chevrolets as a special order color, and today there seems to be a lot of Camaros that have come out of the woodwork with that color special ordered.
With that in mind, I would think Ontario Orange could have been special ordered in 71-72 on any Chevrolet, but I have yet to see or hear of it.
I found some of these videos of corvettes forsale in Ontario Orange to give more of a "in action" view of how the light reflects on this color. These are more than likely base coat/clear coat paint systems too.
https://youtu.be/AZIRXJn5_dU
https://youtu.be/cO5yltTYy4Q