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Yes the depth is different and you will need adapters, what will happen if you don't is when you close the trunk the bar that swings inside will hit the speaker. (Gen 6 Gen 5/5.5 is fine)
Polk is good I have two subs from them and the quality is very good with a sealed enclose, not sure about speakers but should be good as well, Boston Acoustics is good also not sure about it price wise since subs were a little out of my range when I bought mine, personally for speakers I have 4 Alpine type R's and had them for almost two years running with an amp and have had no problems and really good quality (besides me overpowering them and blowing one of them once I've had no problems lol)
Now do you only plan to replace speakers and thats it or are you considering the unit and amp as well? If you only replace the speakers with noting else don't expect too much of an improvement just a heads up. Maybe read about it a little more and complete set-ups. Also there was a list thats updated circulating around forums and google or reputable brands for amps/subs/speakers separately and what each company is good for try to get a hold of that if you're looking for alternatives since sometimes forum threads can be more bias since you only get a very limited opinion.
Good luck!
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