Hey, Mine actually came on the car when I imported it from Japan. I did find a company in california that sold Auto Couture stuff and could get Evolution Explosion parts in for the z32 but it was big money and I can't remember the name.
Take a look here
http://www.auto-couture.com/contact_en/global.html and start googling and making phone calls and you may be able to find someone who can import you a kit.