AFAIK, there's no such beast for it. You'll find that it's for the models that have XP MCE with the TV display unit.
I suppose you could get the whole TV unit (it's Expresscard 54) off of ebay. I see them there all the time, but you probably can't use it with XP Pro.

One of these days, I'm gonna buy one and play with it. Have Vista here (from MSDN) with all the bells and whistles. it should work fine there.