Q 121

Is there any variant of the vampire template that would make it possible for Giant-type creatures to become vampires?

I've been looking at one of the mini-adventures at the back of Libris Mortis (the Fanghurst adventure site) which features a vampiric Ogre and a vampiric Ogre Mage, but I don't know of anything that actually makes that a legal use of the template. (Possibly of note is that the Ogre Vampire only has his 4 racial Hit Dice, which besides being the wrong creature type also disqualifies him from being a full vampire by RAW, meaning this may just be poorly written.)

I don't have a problem house-ruling vampiric giants, but I want to make sure I'm not missing something first.