Hi Pchs,
It's no longer possible to download the drivers for these printers.
However, inside windows update there should be drivers, basic ones, that can be used for the simplst printing jobs.
I know you've said that it's a standalone machine without internet access so, basically, the answer is that if that is the case you're not really able to get the drivers, however, if you're somehow able to get the achines to an internat connection along with the printers you might be in luck.
I cannot however guarantee that it will work, but it's worth a try:
When you connect the USB cable to the printer and then to the computer, or Windows 8 detects that the printer is on the same network as the PC, Windows activates Windows Update. Windows Update searches online for the most recent in-OS printer driver on the Windows Update site. If the online driver is more recent than the driver stored in Windows, the computer downloads and installs the updated driver. The Windows Update process takes place automatically.
I hope the above, even though not the solution you were looking for, has helped you by providing you some info.