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Remove the packing foam from the bezel inside cover before installing it.
Once the SBC 5000 series chassis is mounted in the rack, attach the front bezel to the chassis by aligning the four ball studs located on the bezel assembly to the ball stud sockets on the front of the chassis. Apply equal forward pressure to the four corners of the bezel assembly until each of the four corners "click" in place.
For more information, SBC 5000 Series Bezel.