Identification of Symantec Enterprise Firewall Version

I've been looking for a way to identify SEF from the outside. nmap and
Nessus seem to have tests associated with version 6.x but not for 7.x
or 8.x.

Can someone out there with a definate version 7 or version 8 intsall
help me out with the following:

1) telnet 80
2) Enter "HEAD" (without quotes) and hit enter. [I know HEAD isn't a
valid command like that, but that's kinda the point]
3) An error should be displayed including the Server information
string. [You may have to sroll back to see it]

On a SEF 6.x installation this appears as "Server: Simple, Secure Web
Server 1.1"

Can you confirm that 7.x and 8.x reply with a different Server string?