FYI. I went out and bought my turbo manifold gaskets for my CA18DET today.

Lincorp Automotive (They are the importer of Nissan parts, including grey market)
3 Grand Avenue, Camelia (Opposite Rose Hill Horse Racing track)
Phone: +61 2 9684-5777 Fax: +61 2 9684-52222

AU$59.64 - NI-14036-D4200 - Head to exhaust man. gaskets (4 smaller ones)
AU$42.44 - NI-14415-75F10 - Exhaust man. to turbo gasket (rectangular from SR20DET 200SX)
AU$48.44 - NI-14445-75F10 - Turbo to dump pipe (200SX)

Total Cost AU$165.55

I managed to get a 20% trade discount. The guy must have liked me. Otherwise these parts would have cost closer to AU$195.

Maybe this info will help someone else out in future.

Chris