NEC Express5800 User Manual page 295

11.
Align the screw holes on the device with those on the file bay and secure the device by
using the four screws provided with the device.
IMPORTANT:
Use the screws provided with the optional device to secure it. If not,
use the screws provided with the server. Using screws longer than
the required length may cause the device to be damaged.
Align the front face of the device to be installed with the front face
of the factory-installed optical disk drive.
When installing a device that has a protrusion on its front face such
as a cover, it may interference with the front bezel. In such case,
install a device rearward so that it would not interference with the
front bezel.
Upgrading Your Server 9-39