I already said finding some parts swapped on a RX3 would be very difficult. So instead I found a Fairlady ZG with a Skyline C210 tail piece on it:

Fairlady ZG with Skyline tail piece
Would that do as well?
Found at [andore]
Tags: fairlady zg, hs30-h, nissan skyline, part swaps
its not a Z,if you loook on details etc,you will find out its a c210….so c210 with Z tails
LOL! So it is the other way around!
But you are right: it does not have the same over fenders as the ZG…
also bumper etc etc,but stil its an interesting find,i didnt saw any c210 with Z tails….or i just dont remember any now xD