I don't work too much for Nissan anymore... I mean I haven't officially quit, but I haven't been in there in over a month now... (except to get my headgasket and rings and bolts, but I snuck past the manager's office :pface) I can call my buddy in parts and he could probably find out if you'd like, but I can't guarentee the cheap price...
oh and there is no equivilent gasket as the turbo to o2 sensor gasket here in the US... keep your old one!
Sean