R15 195/65
15.7 gallons http://www.cargurus.com/Cars/Specs-t26207-2002-L-Series-4-Dr-L200-Sedan.html
On the LW200 it is in front of then right front tire, just behind the bumper. It is small, about the size of your hand.
18's are the biggest
8/1 is the stock rim size for a 1994 Saturn sc
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"
check out crutchfield.com. enter year and make and they show all specs for audio related.
6.5in
15"
P205/65r15
15 inches
185/65 R15