Toslink Optical bracket - A question of power

I'm looking to get to toslink optical on a PCI bracket such as this one from ebay:

http://www.ebay.co.uk/itm/ASUS-SPDIF-Optical-and-RCA-Out-Plate-Cable-Bracket-/270540056446?pt=PCC_Video_TV_Cards&hash=item3efd71a77e

The problem I have is the spdif header on the motherboard does not have a +5V pin, does anyone have any experience with a similar problem. I wondered if the +5V on spare molex would do?

Steve
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  1. Kinda rare the absence of the 5 volts but if is true is better to get the power from a USB header. It should have the same electrical ground
  2. Thats a very good point, thanks!

    This link shows the board (not my pic), bottom left shows the spdif out - but no +5V.
    http://www.eteknix.com/wp-content/uploads/2012/03/GigabyteZ77DS3H.jpg
    (The board is a gigabyte z77-ds3h in case the link didnt give it away)
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