IBM x3650 M3 Installation And User Manual page 146

Figure 136. Rear controller retention bracket removal
Figure 137. Controller retention bracket installation
Figure 138. Controller retention bracket installation
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System x3650 M3 Types 4255, 7945, and 7949: Installation and User's Guide
c. Install the controller retention bracket from step b by aligning the
retention bracket controller slot and then placing the bracket tabs in the
holes on the chassis and slide the bracket to left until it clicks into place.
d. Install the controller retention bracket from step a by sliding the
bracket inward 1 and pressing down the release tab into place 2 .