Sun Microsystems Enterprise 250 Owner's Manual page 217

The center divider should engage the two large holes in the center of the
backplane.
4. Replace the two screws that secure the cage center divider and the backplane to
the disk cage assembly.
Figure 9–4
What Next
To reassemble the system, complete these tasks:
4 "How to Install the Disk Cage Assembly" on page 167
4 "How to Install the Removable Media Assembly (RMA)" on page 132
4 "How to Install a Disk Drive" on page 137
4 "How to Install the Fan Tray Assembly" on page 151
4 "How to Install the Side Access Panel" on page 62
Note - When you reinstall the disk drives, it is important to return each drive to its
original location.
Removing and Installing Backplanes and Cables
183