Adding ears to a custom race

[Omnishade]

I want to add one of Grimsovereign's excellent elven ears to the Nymphs of Skyrim as a playable option in racemenu, but I can't get them to appear when moving the ear type slider.

 

This is what I've done in TESVEdit only:

 

Spoiler

 

Is there something else I have to do?