Oracle sun X4-8 Installation Manual page 41

2. Install the two spacers in back rack rails.
Studs on the spacers fit into the oval holes on the inside of the back rack rail. Align the bottom
of the spacer with the bottom of the system's rack space.
3. For square hole racks, place cage nuts in the locations indicated by the
alignment template (2). For round-hole racks, go to Step 4.
a. Align the template with the holes where you intend to place the server.
The template has rack alignment images on either side; one for the back rack alignment
[1], and one for the front rack alignment [2].
Install Shelf Rails and Back Mounting Brackets
Rack Installation Instructions 41