They MIGHT work just fine. They might NOT work at all. Network drivers are fickle, not always working or being compatible between versions of Windows. I've seen at least 50 or more specific situations where a downgraded unit would NOT work with the Windows 8 drivers. And by the way, he's NOT looking for windows 8.1 drivers, he's looking for a Windows 7 driver. So this:
For windows 8.1 just use windows 7 drivers they should work just fine.
Cannot even be applied to this thread making it irrelevant. If you know where there are windows 7 drivers for a device that the hardware string does NOT have any older drivers for, by all means, post a link. That's what he's looking for anyhow.