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Beside if you look at Bat's Z and than at the pictures of my Fairlady you can see the little differences in the us-spec and japanese-spec kit.
Like the difference in the skirts and the frontlip vs. complete frontbumper. Also there is a difference in the material PU vs. GFK.
And you will "feel" the difference in the price.
I hope to get some SF Challenges 19" soon so my setup should be completed.