That is a really good question. I am looking at mx6GT91's car, ( from this post http://www.mx6.com/forums/showthread.php?s=&threadid=74544 ) and I would have to say that they wouldn't look very good, except in the innermost portion of the housing. Sorry I can't tell you exactly which light that is, but I don't have my car handy and I can't remember, but I am talking about the portion closest to the grille. It might look a bit crosseyed if you did put it there, though.
On the other hand, if you have a nice set of silvia projectors with a black backing, it would look pretty nice, IMO.
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