When you say if you were to meet a libertarian girl you probably would not be interested anyways because you want someone who is different than you... you do understand no 2 libertarians are the same right? I mean, just look around this place with the vast array of varying ideas, opinions, and personalities.
That being said, there is probably not one specific type of girl interested in libertarian guys.You might have more luck with another libertarian, but there are probably girls of all sorts of backgrounds that are interested in libertarian guys.
If I flipped the question on you, you might see why it is kind of tricky to answer. What type of guys are interested in libertarian girls? Probably not just one type of guy, right?
Either way, good luck in your search.