When looking at the ebay post, I have a set of the "other" speakers. Got them off the net last yr for $199. Never been impressed with the sound they produce, even when the radio is set to just them - they still don't make a lot of sound. I understand they are tiny speakers, but please let's hear something.
Don't know what the PnP kit sounds like but those speakers look much more impressive. If I had it to do over, I would spend the extra bucks on the PnP.
There is an excellent article on Pelican detailing the install. It takes you thru every step start to finish.
http://www.pelicanparts.com/techarticles/box_rear_speakers/box_rear_speakers.htm
If the instructions are like the ones I got, the plug diagram for the back of the radio is very tiny. After I did the install I found a nice diagram in the Radio booklet of my Owners Manual collection. Much easier on the eyes.
Good luck and enjoy.
Terry