As stated above, the HAF 912 doesn't have USB 3.0 front panel ports, unless you have the advanced version, which is limited to Asia only. But this is the part that you look for.http://www.amazon.com/Header-20-Pin-Male-Female-Adapter/sim/B005NJXAV4/2
But be sure that you do mean USB 3.0, not 2.0 because they use a completely different type of plug. In this case, You'd use something like this.http://www.frontx.com/cpx512.html
Thoughy I'm not sure where you could buy one at.