IBM System x3400 Type 7975 Installation Manual page 16

The model number and serial number are on the lower-right side of the bezel, as
shown in the following illustration. The illustration might differ slightly from your
hardware.
Model type/serial number
The server comes in hot-swap and simple-swap models. For additional information,
see the User's Guide on the IBM System x3400 Documentation CD.
Important: The server keys cannot be duplicated by a locksmith. If you lose them,
If you plan to install the server in a rack, you must purchase a Tower-to-Rack Kit
conversion kit. For a list of supported options for the server, see
http://www.ibm.com/servers/eserver/serverproven/compat/us/.
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System x3400 Types 7973, 7974, 7975, and 7976: Installation Guide
order replacement keys from the key manufacturer. The key serial
number and the telephone number of the manufacturer are on a tag
that is attached to the keys.