There is currently no SEP for Linux, nor is there SEP for Linux planned for 12.1. For Linux, use the SAVFL client. The SAVFL client cannot be managed by the SEPM, although it can report logs back to the SEPM by using SAV Reporter, which was released after SAVFL 1.0.10, but can be downloaded from the following KB article.
Symantec AntiVirus for Linux (SAVFL) Reporter 1.0.10 Release Notes
The SAVFL client is 32-bit only. If you take a look at the RPM packaging you will see that the only package that has a 64-bit version is the savap package (AutoProtect), which understandably needs it as it has to hook into the kernel. While the deb packaging has separate 64-bit packages for each one, there binaries are still 32-bit. You'll notice this if you've tried to install and use SAV on a 64-bit debian based system without ia32-libs installed.
If you really need to confirm that the binary is 32-bit, you can use the file command.
file /opt/Symantec/symantec_antivirus/sav
and it should produce an output such as this (note this is from my Ubuntu 10.10 64-bit machine and is showing a 32-bit executable)
/opt/Symantec/symantec_antivirus/sav: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.4.3, stripped