The Nissan FAST computer system is used by dealerships to find part numbers. You can download the program from www.phatg20.net. It is 2 CD image files (for US cars) which you burn onto CDs, and install from there.
Nissan Forums is the go to place to talk about your favorite Nissan model, including the Rogue, Maxima, Altima and even sports cars like the 370Z and 200SX.
