The directions talked about using wood glue and no mention was made of "hot-glue" as some have talked about on this thread.
The new cross-over was screwed into the bottom of the cabinet and can be removed if necessary as it has a contour switch on it (low/medium/high) that, I believe, affects the bass response.
As I didn't have any grills before, I don't have a reference as to whether the new grills are different than the originals due to the new drivers. They fit equally as well on both.
It is too bad that this site doesn't allow photo posting on the threads as I could show you better what I'm talking about.