You could try this:
I did not actually try that version number, but version 5.49 DOES work. However, it is not exactly the right one as there is still a "PCI Communication device" listed in system devices. I also tried version 5.84 which worked as well. So this could work.
I don't know if anyone has come across one that was SPECIFICALLY written for the IAone's modem.
Also, on this page is drivers for video.