Darren,
You will not find these on the Brembo web site and you will also not be able to buy these direct from Brembo as they are on licence to Nissan.
Have a look at the image below and let me know exactly what parts you require as I have access to them and also let me know what your problem was with Nissan in identifying these parts.
Be warned these parts are very, very expensive.
Alex.