For the vert you will have 6.5" speakers in the doors with 1" tweeters. There is a 3.5" center speaker, but I would just disconnect that if I were you. In the back you will have 2 3.5" speakers on either side. These are connected to a high pass filter. Behind the rear seat is a 10" subwoofer. You can buy a mount to replace the sub from
www.********.com.
I myself have replaced everything except the 3.5" speakers. You will definitely need to replace the amp if you want better bass.
To sum up you have:
6.5" X 2
1" Tweeter X 2
3.5" X 3
10" subwoofer X 1