there is a solution which I have used with a digidoc with front mounted usb 2 ports and your problem but it is not for the faint hearted.!!!
I assume you have two front usb 2 ports because of the eight wires.
You need to get two usb2 cables and cut off the device ends !!!
Each cable should contain four coloured wires connect these to the wire ends from your front usb2 ports (colour matching) and then connect the pc end of the modified cables into the backplate connectors from your usb 2 pci card.
I have done this and all worked perfectly, I was patient and soldered the joints and then used heatshrink to ensure no short circuits.
Get it wrong and you will do serious damage to the pci card and probably to the motherboard
PROCEED WITH CAUTION IF YOU GO DOWN THIS ROUTE