Tried this...
A. Nissan SA wont deal outside their country.
B. The prices are bloody expensive. (ie 1200 steering box brand new $1200 aus plus $150 freight) against the price second hand $50....
Further to this if you want a super strong 5 spd with great ratios ring Dellow engineering who does a kit so you can fit a 2T or 3T Toyota Supra box to your A series.
Kit is $650 includes bellhousing, clutch plate to mate with an A series pressure plate reaer tail yoke. $150 to modify a tailshaft and $200 for the Toyota box from a wrecker which are everywhere. it will also allow you the option of using TRD perfromance ratios etc etc.....