Dell PowerEdge C5220 Hardware Owner's Manual page 76

Figure 3-9. Inserting a Linking Board in a SAS Mezzanine Card
7 Flip the mezzanine assembly over and align over the two guide pins on the
sled, see following image.
Figure 3-10. Installing a SAS Mezzanine Assembly in a Sled
NOTE:
The I/O screw bracket tab must be behind the mezzanine bracket.
8 Align the linking board over the sled and insert.
9 Secure the assembly to the sled with the three screws.
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Installing System Components
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