70 L78 Nova?

[LIBoomer]

Guys,
Started digging into this car further. The roll bar in this car has had me wondering about its origin. Does'nt look like a hacked together bar. Somebody had done there homework. Then I get a call from a member, saying his car has what looks like the same mounting positions,





and bolt patterns. This is a one piece bar. It does not bolt together from sections like most after market bars. Notice how it was designed to retain the upper rear seat section. Could there have been someone up around Chicago area that produced these? Does anyone recognise the design?
Thanks, Todd