If you got to Advance Auto they have a section of touch up paints. There is a decoder book on the rack of paints that tells you where to find the paint code and then shows you which touch up paint you need.
http://www.paintscratch.com/
On a 99 Riviera the list of codes for the vehicle is under the spare tire cover, there is placard that is labeled: Service Parts Identification that has the paint code on it. Thats where I would look first on a 95.
Nice car
Bert