Had this issue myself. My car is getting it's BFG inspection on Thursday at Sennelager so fingers crossed I've covered all the bases.
Couple of tips though:
1) Need to be a bit careful about getting lhd lights from the states as my understanding is that the beam pattern is differnrt from the edm ones, and as beam patterns is what all the fuss is about that could potentially be a drama.
2) Not really a tip, more of a word of caution. The companies over here that specifically sell lights to BFG personnel will find it hard to come across 350z models (as there aren't many over here) for less than OEM, new Nissan ones (very ££). Your best bet might be to get on French or German Nissan forums and get asking around there (Google translate is your friend!). I got lucky on here with a guy called Mathus who had a second hand pair for reasonable money.
3) Remember you'll need to swap over the reverse and foglights as well. Not that hard to do, just requires a clear lens (or two) and a bit of wiring. Give me a shout if you get stuck with this.
Good luck!