You can take the DOT number off of the tail light to a major body shop, and they should be able to tell what kind of vehicle the light was original equipment on. You may also try calling Monaco to see if they will tell you what the light originally fit.
Once you know what kind of vehicle the light is from, it will be easy to find many sources on-line like E-Bay or many of the auto parts discounters.
One of the forum members may be able to tell you what kind of vehicle your tail light is from if you would include the model coach that you have in your question.
Gerald
