LUA with Linux Definitions

I have recently installed SEP 12.1.5 for Linux on some Red Hat servers, and are currently being managed by the SEPM. I have not been able to get definition updates to the servers yet. I've pointed the servers to my (internal) LiveUpdate Administrator (LUA), but the servers are not getting any definition updates from the LUA. Do I need to identify specific Linux definitions content (besides SEP) on the LUA? If so, what? I see a choice for Symantec Antivirus for Linux 1.0.5 - is that what's needed on my LUA (I was looking for SEP for Linux defs.)? Or something else? Thank you!