Have you tried the traders on here? would be cheaper than Nissan..
... or have a look at this http://www.350z-uk.com/forum/viewtopic.php?f=31&t=64265&hilit=likiwdart
Pretty sure you can get all sorts of colours
I am sure a certain man with a bright green thing who lives very near you, would be more than happy to insert his electronically fandangled dooby wotsit and tell you whats wrong