do you know anyone with a router, or maybe a wood shop close by? they could make the holes the right size for the new drivers for probably a few bucks, search for these mids at PE #289-025, $3 apiece. and these tweets #270-160, $7 apiece. if you could get the holes done these would make nice additions, also make sure that the wire going to the tweet has a capacitor, you would not want to run a straight signal to it,