ASA5520-MEM-2GB= 2 GB Memory Upgrade for Cisco ASA 5520
ASA 5585-X Half Width Blank Slot Cover Part Number:ASA5585-BLANK-H
ASA 5555-X with SW, 8GE Data, 1GE Mgmt, DC, DES Part Number:ASA5555-DC-K8
ASA 5585-X Chas with SSP60, 6 GE,4 SFP+, 2 GE Mgt,2 AC, DES Part Number:ASA5585-S60-2A-K8
ASA 5585-X Spare Full Width Blank Slot Cover Part Number:ASA5585-BLANK-F=
ASA 5585 HalfWidth Blank-Required if only 1 IO module chosen Part Number:ASA5585-BLANK-H=