If u want to find the installed modules of ur redhat linux machine, u can download this tool to find all Installed Modules

After downloading this tools extract to ur local apache cgi-bin directory and chmod 755 to the .pl file. Then request the file in the browser, which gives u a complete list of installed modules and other additional info about ur machine. This tool gives u exact answer what u want.

If my understanding is correct this tool will help u a lot.