Speaker Size Help.

[KickerGrandPrix]

I have a 06 Pontiac Grand Prix Base Model. I put a aftermarket headunit and 2 12 Kicker Comps. Now my Speakers sound like there going out. I wanna put new speakers in the front and back. Can Someone tell me the size of them?

[1LoudGrandPrix]

6.5s up front 6x9 in rear