I would agree with 1977Chad350. There were different type of bench seats for Novas. Just make sure you take measurements. If changing to a different bench from another car make sure you have good welding skills or have a connection to weld. You may need to modify the seat tracks.
Myself I am eventually changing my bench out for a factory bucket seat and auto. console set up. It is something i have always wanted.
One you didn't mention as a donor was the Malibu. Roughly the same size car just full frame.