There only two types available.
Non Sport Base Brakes that come with the 18" Wheels
Sport Pkg (Akebono) Brakes that come with the 19" Wheels (As in your picture shows)
The dealer would be the quickest place to get the shims replaced unless you track down a wreckecked one with the same Sport Pkg Brakes.
Courtesy Nissan May I say may have that part.
You will have to research that, But honestly by the time it gets to your part of the world? You've might as well as just bought it straight from the dealer unless they are just ridiculous with the price one the shims.
370Z Parts (Z34) 2009-2013 :: Nissan Parts, NISMO and Nissan Accessories - Courtesyparts.com
EDIT: Thank You JARblue