all brackets for Gigabyte mobos are listed at:http://www.giga-byte.co.uk/Products/Motherboard/AccessoryList.aspx
i confirm, for your model the most proper would be bracket model no. 12CR1-1SPOUT-03R. You can connect it to 2 pins of SPDIF_O on the motherboard with 2 out of 3 pins of the bracket, you just leave 1 pin of the brakcet (POWER) not connected and that's all.
have Merry Xmas !