On this point, there is a car on Gumtree at the moment that is originally a Fairlady Z 2+2. (GS30 coupe note: NO R as in GRS30)
http://www.gumtree.com.au/s-ad/mindarie/cars-vans-utes/1975-datsun-260z-2-2-coupe-manual-jdm-fairlady-z-/1059181420
I'm pretty sure the cloth interior was standard for this era of 2+2. Also the gear knob, steering wheel are different to our home market cars (probably to do with ADRs (Australian Design Regulation for our international viewers) and safety requirements forcing the rubber steering wheel in it's place etc..)
The ad says that car is a 75 model, so I'm not sure if it would have been factory fuel injected or not by this time. Pretty sure would have had an L20 fuel injected motor originally though...
Also notice the speedo has a yellow / red line indicating higher and higher speeds. Which our cars did not have, along with the later Calendar clock (single knob)