Slide the UltraSCSI backplane into the backplane slot in the base of the disk cage assembly.
Orient the backplane so that the six SCSI drive connectors are facing the open drive bays.
Insert the six posts at the rear of the disk cage into the corresponding keyholes in the backplane. Lift the backplane slightly so that each post rests in the narrow part of a keyhole.
Push the cage center divider back into the disk cage as far as it can go.
The center divider should engage the two large holes in the center of the backplane.
Replace the two screws that secure the cage center divider and the backplane to the disk cage assembly.