He joined here recently, if you look at the eBay ad it says that 350z uk owners club says it's the only one in country or something like that. The body kit looks right to me with the arch extenders etc.
It's a gamble with any trade in dealer but j17 are known to you and us (the forum) . The car from them may be fantastic but I fear the follow up problems (if you have them) will be met with a brick wall.