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I wasn't sure about the mounting depth of the 6x9. I started thinking to have the 6x9's in the rear doors since I found some 6x8 plates that will mount 6.5"s I could use up front.
I am in the process of replacing my stock rear speakers with a pair of Infinity 6x9s, in my 2005 CC. I had to make the hole bigger (obviously), but other than that they fit pretty easy. The space is a little tight back there, but these speakers aren't overly huge. Infinity Reference 9632cf If they were much bigger though (i.e. the magnet), I don't know if they would have fit. The space that the speaker sits in narrows quite a bit, to make room for the door latch and such. I'll try to post some pics after I finish installing them, just waiting on the wiring adapter.
I got the speakers finished up and everything is back together again. Here are some pics of what I had to do to make them fit. I hope this helps someone out.