These are the Version 2.2 V.90 .inf drivers and V.90 Firmware for Australia. I found links for the US upgrade but none for AU. I am not too sure if the firmware is the same.
Just plug the modem into a com port and run the flash updater. Update the driver and away you go.
I just dug out this old modem and looked everywhere for the drivers. No such luck. Finally found them on an old tape backup from 1999.
I have uploaded them so I can get them next time I need them myself as well as for anybody else who needs them. -)
Hope it is of some use to someone else