Someone is selling their SF-challenges on EBay - the reason I'm posting this is because they are very conservative offsets (19x8.5 +34, 19x9.5 +35) and should work with the Sedan... I don't have a link to the specific listing, but if you search "350Z wheels" and sort them from most expensive to least, you'll find them...

They are Mercury Silver btw - with Dunlops - I think they're only going for like $2200 or something crazy...