http://www.sylvania.com/ConsumerProducts/AutomotiveLighting/LampReplacementGuide/ is a link that you can get the correct light number for any of the lights on your car. (including all C3 any year). By the way you are looking for 194LL (LL) is just long life or you can use 194 also or a 161. The difference is the 194 are 14Volt 3.8Watts and the 161 are 14 Volt 2.7Watts.
I purchase mine at http://www.memotronics.com/ because he sends them via mail and only charges you what it cost not a flat rate which if all you are purchasing are lights would normally be more than the cost of what you purchased.