That photo showing the blue interior is a not a factory install...strictly custom made by the owner.
I did a quick search and found a photo for a 4 door car...but, it will give you the idea. The standard cloth bench seat was a combination of vinyl and cloth. The seat was not as fancy as the custom interior, less padding, lower quality cloth, etc.
https://myclassicgarage.com/marketpl...chevrolet-nova
A showroom sales book would be a good source for the information...
-wilma