Questions about front IO headers

[randomviewer896]

I'm doing a case mod and I have a few questions about a couple of the onboard connectors on my motherboard.
I have an Asus Crosshair VI and I'm having trouble finding documentation for one of the headers on it.
What is the pinout for the header labelled ROG_EXT? I have very little use use for the ROG Front Base (the ASUS proprietary display that interfaces to it), I just want to use that extra USB port it purports to have. I tried connecting a normal USB2.0 header into it and it didn't do anything.
A little bit of searching brings me to here: 

but this doesn't exactly answer my question: How can I make use of it?
And lastly, where can I buy a usb3.1 external header? I see tons of USB3 and USB2 external headers to buy but no such thing seems to exist for this new 3.1 connector.

[RUWO_builder]

there is no usb passtruogh in that connecctor. its just some  serial interfaces. probably I2Cor something similar. the internal chips in frontbase function like a usb hub, getting out a single usb. you could buy a frontase and tear all the buttons and screen off, but that seems a little expansive. better buying a internal usb hub then.