IBM System x3650 M3 4255 Installation And User Manual page 102

19. Remove the expansion-slot bracket that is screwed to the vertical wall above
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System x3650 M3 Types 4255, 7945, and 7949: Installation and User's Guide
c. Install the SAS riser-card with the M5015 adapter into the connector on the
system board, making sure that the alignment post goes through the hole
in the controller. Press the riser card into place until the latch at the rear of
the card snaps closed.
the power supply and install the expansion-slot bracket on another M5015
adapter:
a. Orient the M5015 adapter as shown in the illustration.