I'm not sure exactly which parts you need. With your light problem I guess you're missing the liners in the wheel wells.
Here's a link to Courtesy Parts for those (click on the Front Fender & Fitting diagram).
If you need the front undertray replaced there are a couple of fabricators here on NICO that makes a nice aluminium version to replace the plastic OEM supplied one,
350Z & G35 Aluminium Undertray and
350Z Aluminium Splash Shield. GT Spec also makes one, but it's a little more pricey and harder to track down...it's not even listed on their website.
CongratZ on the purchase and welcome to NICO!
