Yes those are the speakers. I got mine on amazon.com for $115 shipped.
As far as the stock speakers go? The tweeter has a capacitor or high pass filter integrated directly on the speaker assembly. The main woofer has nothing so it is getting the "full range' audio signal coming from the amp.
This is why the audio quality is a little on the poor side, woofers are not designed to play highs and sound good doing it. It is also the reason that the polk speakers are not as loud as the stock speakers. If I were to bypass the crossover and connect the polk directly to the amp giving it full range to the woofer, it would be extremely loud but sound like crap.
Now when I say the Polk's are not as loud, I mean just that but they are not off by much. They are almost as loud as the stock speakers were but the big difference is the sound quality.
Everything sounds crystal clear cranked all the way up to 30 on the volume. There are songs that I could not play before because they distorted the speakers and sounded like the speakers were blown. This is not the case any more!
Also keep in mind that all speakers take a little "breaking in" before they reach their full potential. These polks will just get better with time.
All this being said, if you are really considering doing this. Keep in mind that the install is kind of a PITA. I did figure out that I could mount them without drilling any new holes and without modifying the holes. But I did have to trim off one of the tabs on the dash piece. It will not fit with the polks in there because the ring that you must use to to keep it from hitting in the back makes the polk extend out from the speaker location about 3/8" further than stock and the dash will hit the speaker.
I busted the dremmal tool back out and trimmed more off the speakers and ground that tab off the dash. It now fits but is touching the frame of the speakers. Not a problem and does not affect the speakers at all.
You also need to be comfortable cutting the crap out of your new $120 speakers!
All you have to do is lay the stock speaker on top of the polk and line the screw holes up them bolt the speakers together and trace out the squarish shap of the stock speaker onto the polk. Do the same with the mounting ring then use a dremmel tool and trim them. They will fit right in and bolt up to the dash with the stock screw holes. You will need to buy some longer 10-32 screws though, the stock one are not long enough.
I also took one of the rear speaker pods off yesterday to see if the larger front speakers would fit. Hell no! You would have to build a custom speaker pod to fit anything other than the 4" speaker that is there now. Might be able to modify it to fit a 5" but no way is a 6.5" gonna fit!
The rain finally let up and I went for a ride last night. I am happy with these Polk's. They sound great and distortion free with the volume all the way up. I did shift the balance to the front speakers by one notch because I can now hear the rear speakers. That would be a good thing but what I hear is a lot of noise drowning out the sound from the polks. I will be looking into a set of polks for the rear next.
All in all the system sounds much better now and will sound even better once I replace the rear speakers and the polks get broke in a little.
Here is a picture of the stock front speaker system.