These two places would more the likely be able to help, plenty of Sport Sedans run on their wheels
- Simmons Wheels
http://www.simmonswheel.com.au/
- OZWheel who are now out at St Marys in Western Sydney, I think the phone numbers on the website are the old ones though.
http://www.ozwheelaustralia.com.au
By the way how many locating pins have you got on your centre lock hubs? I might know of some second hand 16 inch centre lock wheels with Sport Sedan friendly off sets.