Thinking out aloud. The R34 GT-T wing has been done & so has the R32 GTR wing. Standard R32 GTST spoiler on the z's hatch, trying to picture it out of sheer curiosity ..
I used to have one on my old car. Tried fitting it on my 2+2 and the wing is much too narrow for the Z.
Apart from being too narrow, & say that wasn't the case, how did it flow with the car ? Did it sit ok on the hatch .. ? Knew your username looked familiar, what # set of wheels are you up to now ??
It sat ok, but since it was way too narrow once I laid it on the hatch, I didn't bother looking at how it flowed. Like I said, it was waaaaaaaay too narrow.