But all that does is add USB3.0 ports to the back of my PC.
Do you have usb 3.0 on your motherboard? On the back panel? If so, you can buy this THIS Which would connect to the 2 Usb 3.0 ports on the back of your motherboard , though it only has usb 3.0.
I had the same situation where my case had USB 3.0 ports on the front i/o panel but it required usb 3.0 headers on the motherboard which I didnt have, so i bought THIS. So if you wanted a USB 3.0 front panel that had the headers that look like this: then it would work fine.