[Accord Man]

well if your 6.5s are rattling something, then its caus they arent properly installed.. Trust on this one.. But if your putting dynamat to keep outside noise from coming in, then its fine..

And for the rears, you could easily cut out a 6 * 9 hole.. most of the time when you buy a speaker they include a template, just in case you'Re gonna do the cutting.. so you place your template on or under the deck.. and cut away!

PLus. both sizes are pretty much the same price..