WoW Gas Mask

Anybody who's been around the Howling Fjord as a Horde character would have probably noticed all these Forsaken running around wearing gas masks.

Gas. Masks.
With fricken' spikes on the filters, and translucent green bulbous eye pieces.

And I know what went through your mind when you saw those gas masks:
'I needs to get me one of them'.

Problem is, you can't buy it. It's not even a drop, as far as I can tell. And if it is, it's probably so low [00000000000.01% drop rate] that nobody's ever found it.

No problem, you say to yourself. I'll just look it up on the WMV.
but it isn't there.
You try everything - Gas, Mask, Forsaken, Plague... nothing yields any desired results.

Even worse, you can actually find it inside WMV [Item > Objectcomponents > head > helm_mask_plague_???, last three is race and gender], but you can't equip it to a character!

It's tragic - I know somehow the guys at WoW did it, so wouldn't it make sense that WMV can do it? I thought so, but apparently not!