Just come across this post, and maybe I can be some help here.....
I am currently working on 2 nav housing re-trofit with aftermarket Nav unit, therefore I have 2 OEM screen lying around.
Its the Euro / JDM spec, which is 5.5" in size. I did not have a way to test its full funtionality, but it was taken out of a running Altezza.
One is a COMPLETE unit with the screen/ribbon/metal casing/cooling fan/plastic cover/etc.....
One is just the SCREEN itself
Email me at rexchris66@hotmail.com if you are interested, I will sell it for a good price