Not likely. They have a 6.8" outer frame and that's bigger than the Vtwin adapter can handle. 6.5-6.6 is about the max width of outer frame in order to get the grille on.
I don't know what your looking for sound wise, but with those Hertz MPKs in the fairing I can't imagine that these GZs are a good match. When I open a thread. Read questions like this when I have an idea of what a guy is using I scratch my head. Can you elaborate? That would help more with direction/suggestions.