Strange USB connectors, P180 MINI

I bought an Antec P180 mini and instead of a 10pin USB connector for the front panel I have two 5pin connectors!? The manual says there should be a single 10pin connector which is impossible to plug in the wrong way, so what do I do with these connectors? I've no idea why there'd be 2 but I assume they both go into a single usb motherboard connection, they're labelled as follows:

2.0 USB 1

VCC1
DATA-1
DATA+1
GND1
SHIELD1

2.0 USB2

VCC2
DATA-2
DATA+2
GND2
SHIELD2

from the pin layout in the mobo manual I can see which way round the individual connectors should be alined, but which should be plugged into the top row of pins, and which the bottom?

These odd connectors make me a little wary of connecting it all (or the other connectors) but I don't really want to send it all back now.

Motherboard: ASUS M4A78-EM

If you haven't seen this already, check it out.

http://forums.hexus.net/help-technic...usb-cable.html

As I said in the linked thread, they'll work perfectly.

Worry not.