Oculus Native Spatializer Plugin Missing?

Not sure what I’m really missing, but when setting up the Audio Manager from Edit>Project Settings>Audio, the drop down menu for the Spatializer Plugin only shows ‘None’. And to my knowledge Unity 5.4.0f3 should have a built in Spatializer on hand.

Are their other steps related to having the option show up? If so I haven’t found anything stating those steps.

Any help would be appreciated!

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It should appear in the options.
Maybe try to download the full version from the oculus website :
https://developer3.oculus.com/downloads/