Les,
Even though the paint numbers are very helpful, you will probably need to have the paint color matched because of the 13 years of sun fading. Most large body shops today can use a computer to match you color, regardless of how much fading there is. For other shops it is just trial and error.
Cars have a problem with different levels of fading, in that the upper panels that face the sun on a teenage car can be one color, and the sides can be several shades darker, especially in the desert Southwest. However, since you do not see the part of a coach that faces the sun, (the roof) that is usually not a problem.
Gerald