It's a version 1 Nismo body kit comprising of a wing, side skirts, rear spats which attach to the bottom side of the rear bumper and a Nismo bumper.
You can purchase an aftermarket front lip which will give you a very similar looking front for much less money, and there are plenty of different kits out there
Tarmacsportz are a trusted source of such parts.
https://www.tarmacsportz.co.uk/catalogsearch/result/?cat=44&q=350z+sidesteps