This is a collection of 2 different zip files containing drivers for several different GVC 33.6 modems. Sorry I don't know any specific models it works with... but as you know GVC drivers are now almost impossible to come by. Perhaps these will help someone needing them.
Most of these drivers must be installed via control panel, modems icon, then select have disk and then point to the locating where you have the unzipped files. You will be presented with several modem models to choose from the list. Just try different ones to see which one works best for you.