How can I Include an installed module in customer RCP application?

Okay, I finally got it working.  I had to uninstall the pluggins I downloaded and then modify the Update Center settings by changing the Plugin Install Location to Force install into shared directories, which is not the default.  I then downloaded the pluggins again and now they were placed within the installation directory of NetBeans and voila! they showed up in the Libraries list that I could then add a dependency to in my project.  I never could get them to show up by adding the netbeans_extraclusters line to the NetBeans conf file.  Hope this saves somebody else from spending time trying to figure this out.

Thanks for the help and suggestions.