Quite a few places on here that can source something like this. Tarmac, Torqen, Clark Motorsport, Cougar Store, Abbey Motorsport H-Dev (not sure if they do stuff like this), and many many more.
Worth dropping a message out to all the traders to see who can supply. Definitely worth going a little extra for a good fitting one as some require lots of adjustment.
If you look in the traders section you will be able to see all of our approved traders. http://www.350z-uk.com/forum/93-professional-traders/