Which SPDIF-out bracket do I need?

Question

I've recently noticed my speaker set has an optical input (TOSLINK), but my mainboard (Gigabyte GA-Z170-HD3P Intel Z170) has no built-in output on its backplate. It does have a 2-pin SPDIF_O socket though, as told by the manual (page 16, section 10). The pin description says SPDIFO and GND.

Therefore, I want to put a bracket onto it to go out of the backside. Only problem is that I cannot seem to find any suitable bracket for this, as all the ones I can find have 3 pins (POWER, SPDIFO, GND).

What do I do here?