You know what, I give up.
Even if you didn't know anything about 350Z's, just typing in "350Z wide body kit" into Google would yield a number of hits.
If you are as good as you say you are, then you wouldn't have promised a "client" that you could take the job to a deadline.
Take a step back and re read what you wrote, digest it and read it again but see it as if it's posted by somebody else, see if you think you would like to be to spoken like that.
Don't pass judgement on people you don't even know, don't assume.
Perhaps you can learn from this and next time when taking a job for a car you don't know much about do some research and then inform the client how long its going to take in realistic terms.
In regards to your question on the car in the "Post your fav wheels" thread page 4,
That will be madmarkys car, but that's the Veilside kit without widearch and the front wings are vented items made by Border, quite rare in the UK, expect to pay a premium for them as they will have to be imported from either Japan or the US.
You could check out z1automotive, they stock a variety of kits, but again, they are based in the US.
SumoPower are based in the UK, see what they have.
As far as I know, following companies have made widebody kits:
Veilside
Do-Luck
D.A.M.D.
Top Secret