I would think the bumper would just be 'plug and play' as far as replacing out your based bumper with the Nismo one. As for the search feature on this site - to say its bad is an understatement (just my .02) so when searching, go through google:
the370z.com: v1 nismo bumper replacement
From there this came up:
TjLaZer's Monterey Blue Z
Reddit has a v2 replacement and should provide some good info:
https://www.reddit.com/r/370z/commen..._want_to_swap/
Youtube:
https://www.youtube.com/watch?v=gc4E-Rat-us
https://www.youtube.com/watch?v=w_OyaBS6u04
well, good luck with your bumper replacement but Z1 also can provide info on other parts you'll need to get that 'OEM fitment' you are after etc