Step 1.  (Optional) Hook the securing clip over the riser adapter on the riser cage. 
Figure 280. 7mm drive cage securing clip installation
Step 2.  Install the 7mm drive cage to the riser cage. 
Figure 281. 7mm drive cage installation
a.  Align the left-side pin on the 7mm drive cage with the positioning slot on the securing clip, the 
two holes on the side brackets of the 7mm drive cage with the two holes on the front of the 
riser cage.
b.  Install the two screws to secure the 7mm drive cage in place.
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ThinkSystem SR650 V2Maintenance Manual