304/360 factory exhaust flange plates

[OEM1984CJ7]

Can someone tell me if these are the factory style exhaust flanges. I pulled this homemade Y pipe from a CJ at pull-a-part and they look original. I will be running 2" pipe duals with thrush turbos.

They are different in mounting and size. I got the donut gaskets also.

Drivers side:

Passenger side:

 

[Purple77CJ7]

They look like OEM, but they could also have been replaced by a muffler shop. That style is pretty common.