They moved the pillar speakers to the dash (3 1/2 in speakers now) and I have no idea about the 7th mystery speaker. I cheaped out and didn't get the Infinity system so I could put my own radio and speakers in. Only hassle is the front door speakers. The factory includes "6x9" speakers, but you can't go buy a real 6x9 and put in it as it will hit the window glass or gear, and it is really a 5x8 cutout. So, 6 1/2 speakers are the way to go, I think. So much for my bass. Not sure where I would mount a sub to compensate. A real PITA. Dodge could have done much better in designing a standard mounting.
James