I bought this Shiro recently, and this picture is from an ad i found for this very car from 2008 (3 owners ago).
It went to some dumb kid who ripped the body kit off of it and also raped it for the shiro front air dam. He then did some terrible paint touch ups to cover the mount holes.
He then sold it to somebody I worked with who owned it for 2 years and I just bought it a couple of weeks ago.

I have had 4 z31's in my time and am very well versed in Z-cars. I have only seen a few kits available for this car and never anything like this. I have checked around and can't seem to find anything. Zbum's site only lists a few that are no longer produced. Im considering the styleauto kit which is still available but will cost about $3000 shipped to me in Canada.

I really think these side skirts work well with the car, they are not over doing it, yet add a bit of sexiness.

On a side note, it is an official Shiro (checked VIN) and still has the recarro seats, VLSD, beefy springs. Its just missing the wheels, air dam, and factory side skirts (has regular grey colored ones from another z31)

Any info would be appreciated!