Rear Deck Speakers for '06 G6

[Koridan 0]

I am trying to remove the factory speakers from the back deck of the G6 but I am Not sure how to remove them. The Speaker grills dont seem to pop off. There are some clips in the trunk around each speaker but when I undo those, all it does is loosen the entire back deck Any Idea on how to change? Also I have 6x8's from my old car I would like to put in. But the factory size is 6x9? Will it still work out Fitting the 6x8's in? Thanks in advance

~MadroX