Dell PowerEdge VRTX Owner's Manual page 70

Figure 41. Removing and Installing the PCIe Cage
1. metal standoffs (2)
2. screws (2)
3. release latch
4. PCIe cage
5. guide pin
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6. expansion-card riser connectors (2)
7. metal tabs on the chassis (4)
8. screw holes (2)
9. bracket on chassis side