These heads are for use with the GE/PD facemapper available at http://www.rarewitchproject.com/downloads.php
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The ghoulGE head replaces the terrorist face in Goldeneye.  Don't worry, it's supposed to look orange.

The PD ghoul head will replace just about any head in Perfect Dark since they are so similar.  The sides are actually just the back of the terrorist's head from GE.  At the moment, the back of the player's heads can not be replaced, so it's probably going to look a little funny no matter what you do; have fun with it, it's not a beauty pagent. 
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You might recognize this mask if you're browsing around Wal-Mart sometime.  Funny thing, that.

-Zoinkity