HP Netserver LP 2000r (1.13, 1.26 & 1.40 GHz) Installation Sheet

2-Post Rack Installation (continued)
2-Post Rack Installation
NOTE) The installed inner-rails shipped with the
  HP Netserver are used for the 4-post HP racks. 
  These rails must be removed for 2-post rack  
  installation and replaced with the mounting  
  brackets.
Flush Mounting
Center Mounting
Flush Mount Brackets Only
Center Mount Brackets Only
WARNING To prevent equipment damage, pull out the
  anti-tip foot and ensure the rack leveler screws
  are in firm contact with the floor.
4-Post Rack Installation