IBM System x3550 M5 Type 5463 Installation And Service Manual page 220

Figure 120. 4 x 2.5-inch hot-swap hard disk drive backplane installation
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IBM System x3550 M5 Type 5463: Installation and Service Guide
b. Carefully lower the hard disk drive backplane until it is fully seated in the
chassis.
Steps for installing a 10 x 2.5-inch hot-swap hard disk drive backplane.
a. Align the backplane with the slots on the chassis.
b. Carefully lower the hard disk drive backplane until it is fully seated in the
chassis.