Page 1 of SPDIF mobo headers

HI there

I recently bought an AOpen vKM400 mobo for use in a HTPC that I am building. I want to use an optical cable to connect the pc to an av amp, but the mobo doesnt have a SPDIF port on it. It does however have the pins on the mobo to connect an optional bracket for this purpose, but I cannot find one anywhere. So I had a nose through some parts I had lying around and found a SPDIF bracket from a MSI mobo.

The problem that I have is that the pins on the Aopen mobo are 1.+5v, 2.Key, 3.SPDIF Out. The pins on the MSI mobo are 1.VCC, 2.SPDIF, 3. NC. Is there any way I can modify the bracket to use it on the Aopen mobo. I`m guessing that the SPDIF and SPDIF Out pins are the same, but which pin corresponds to the +5v and the Key? What does VCC ans NC stand for?

Thanks in advance for any help :D

VCC will be the +5v eqiv.. so.. just stick the other one in the final pin