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Woop woop welcome to the CL club and enjoy your stay.....changing the speakers isnt as hard as it may seem. Just a little hint, after you pull the back seat out, you wont need to remove the pillars, do what the rightup says just up to the pillars. I was able to remove that large panel without pulling out the pillars, just be gentle when you bend it, and you should be fine ...
I'd say ur best bet is to remove the rear deck lid.. take out the speaker and the enclosure that its in and go to wherever ur planning on buying the speakers and test fit it...
Most places will give you sizes for the opening of the cut out in the rear deck lid, not the enclosure size, and In my opinion its best if u get a speaker to fit in the enclosure bc having that around each speaker = better sound quality..
oh yea and search... most of these topics have all been discussed