CablesAndKits 1RU (1 Rack Unit) Recessed Rack Adapter, 3" Recess or Extend from Face of Rack, Rail Depth Adapter, Extender, 25 lb (11 kg) Weight Capacity, for Computers, Servers or Network Equipment : Musical Instruments - Amazon.com
Amazon.com: CablesAndKits 2RU (2 Rack Unit) Recessed Rack Adapter, 3" Recess from Face of Rack, for Computers, Servers or Network Equipment : Electronics