Remove the inner door panel.See link below.
6.5" speakers in the front
6 1/2
http://saturnseries.net/DIY%20Guides/S-Series/DIYGuideS-Series-Inner%20Door%20Panel.htm
The 1999 Saturn SL2 has four 6 1/2" speakers. Two in the front doors and two in the back deck above the trunk space.
You need to remove the Interior door panel. From there you can gain access to the speaker and replace it as needed.
4"
The front speakers are 6 1/2" and rear speakers are 5 1/4"
Should be 6.5" speakers in the front doors and 6"x9" in the back dash
how do i replace the front strut on 1999 Saab 9-3
Remove the instrument cluster then replace the bulbs. = =
It is behind a piece of plastic on driver's side in front of the door near the floor.
According to Crutchfield the front speakers on a 1999 Tiburon are 6 and 3/4 inches.