Cisco SRS Series Installation Manual page 220

Steps
Figure 113: Attaching the Rear Louver Grille
Step 10
Press the louver grille firmly until its ball studs snap onto the ball stud retainers.
Attaching the Rear Lower Bezel
Step 11
Carefully slot the hook hanger brackets on the bottom of the lower chassis cosmetic bezel over the tabs on the vertical
cable troughs.
Cisco CRS Routers 16-Slot Line Card Chassis Installation Guide
200
Installing and Removing Exterior Cosmetic Components