try these guys in qld they are a quaife stockist
http://www.eurospeed.com.au/
or if your not brand minded try tran-x they do 4 & 5 speed close ratio sets as well ive got a set in my rally car speak to smcka he gets them in

http://www.smckaperformance.com.au/
http://www.tran-x.com/index.html