i have looked all over the site and i cant find the speaker sizes for my 06 base. just by looking i want to say 6.5 in the doors and behind the seats, and 1.25 tweeters near the window. any confirmation out there??

 

These are the speakers I added to my car. I have an '04, but I don't think the sizes have changed. Crutchfield is a great resource for information on sizing.

Alpine SPR-17S
6-3/4" component speaker system — also fits 6-1/2" openings
1" silk ring-dome tweeter

Alpine SPR-17C
6-3/4" 2-way car speakers

 

6.5" in the rear and doors and 1" in the sail panels.

 

The speaker diameter for the doors and the rear are 6.5”, but you can fit different diameters depending upon the manufacturer’s mount (i.e., a 6 ¾” diameter speaker will probably fit the rear speaker slot).

The Sail Panel holds a small tweeter (1.25” diameter).

However… The diameter is only one dimension. It’s actually the depth that is most important when mounting speakers in the doors. Depth isn’t much of a limitation when mounting rear speakers. You can also have depth issues when mounting aftermarket tweeters in the Sail Panel.

--Spike