If I cant find the driver anywhere else I use a a website, devid.info, to find drivers.
This isn't another one of those sites that you see in ad's like "super driver doctor" os some other bs like that. This site requires you to go into the device manager and get the hardware id (see below) which is unique to the device, and use that to find a driver through its user updated database. This is a great tool to use and I have had very great results from the site. Good luck.
Hardware ID:from device manager right click on the unknown device, select properties, go to details, scroll down to hardware id, highlight the top id, press ctrl+c to copy as right clicking wont work here