ASA5508-SSD= ASA 5508-X SSD
ASA 5525-X with SW, 8GE Data, 1GE Mgmt, AC, DES Part Number:ASA5525-K8
ASA 5585-X Chassis with SSP40,6GE,4SFP+,2GE Mgt,1 AC,DES Part Number:ASA5585-S40-K8
ASA 5585-X Half Width Blank Slot Cover Part Number:ASA5585-BLANK-H
ASA 5555-X with SW, 8GE Data, 1GE Mgmt, AC, DES Part Number:ASA5555-K8
ASA 5545-X with SW, 8GE Data, 1GE Mgmt, AC, DES Part Number:ASA5545-K8