IBM Rear Door Heat eXchanger V2 Installation And Maintenance Manual page 42

7. Install the latch plate on the left side of the rack.
M6 clip nuts
Latch plate
Screws
Figure 18. Installing the latch plate
a. Install two M6 clip nuts on the left-side rack-mounting flange of the rack.
b. Align the holes in the latch plate with the holes in the flange and clip nuts;
then, secure the latch plate in place with two M6 screws.
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Rear Door Heat eXchanger V2: Installation and Maintenance Guide