IBM Power System 5802 Instruction Manual page 26

Figure 13. Installing the retention brackets
n. Use one of the following options to secure the expansion unit to the rack:
v If you have installed the retention brackets, apply the four securing screws (A) as shown in
Figure 14 on page 15.
v If you have installed the cable management bracket, apply the four securing screws (B), as
shown in Figure 14 on page 15.
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Power Systems: Installing the 5802 and 5877 expansion units