Wheels were made by Cast Alloy in Adelaide(90% sure)......be aware that there are 2 different wheel setups....the 1990 wheels were setup for smaller hubs and lighter......1992 wheels have a larger hub setup and were heavier. You can tell the different wheels fairly easy as I am pretty sure the smaller centre lock's had the Nissan logo on them.
I do have access to some genuine set's of wheels, but all of these wheels would have to be crack tested and the price is a little heafty for what they are.....IMO the guy's dreaming if he thinks his going to get what his asking!
PM me for further detail if your interested!