Compaq ProLiant 5500 Setup And Installation Manual page 54

IMPORTANT: The template is two-sided (front and back) and printed with
arrows that show you where the screws will be inserted, both for the
mounting bracket assemblies and for the thumbscrews that will secure the
server's face plate to the front of the rack.
Align the template carefully with the holes on the rack, to determine the
exact placement of the screws.
2. When you mark the positioning of the mounting bracket screws, also
mark the positioning in the front of the rack for the cage nuts. These are
two slots marked "C" on the template. The cage nuts will hold the
thumbscrews through the server's face plate.
Be sure to follow the alignment instructions on the template, and keep
the sides of the template squared up with the sides of the rack. Tick
marks on the rack's vertical rails will help you maintain the proper
alignment.
For use with Intel Pentium II Xeon processor-based servers only
Compaq ProLiant 5500 Servers Setup and Installation Guide
3-15