check out crutchfield.com. enter year and make and they show all specs for audio related.
Go to crutchfield.com and enter your vechicle information in the outfit my car section it will bring up the size for you
The front are 6.5" and the rear are 5.25" and if yours has tweeters then those are .75"
18's are the biggest
R15 195/65
The 2003 Saturn L200 does not have a camshaft position sensor.
12,676km
6.5
6.5in
6.5" round speakers in the front and back.
6.5"-6 3/4" Speakers
2003 Saturn L200 holds 15 gal. of gas.
15.7 gallons http://www.cargurus.com/Cars/Specs-t26207-2002-L-Series-4-Dr-L200-Sedan.html