http://img.dxcdn.com/productimages/sku_155217_1.jpg
This is what you'll need then. The only downside is that you won't be utilizing the USB 3.0 transfer speeds. It'll be clocked down to USB 2.0. Big deal, really if you're not transferring massive loads of information to a device, but it will at least allow you to utilize the front USB ports. Also, it won't eat up 2 USB connections on your motherboard like a passthrough would.