Backplanes — always check if cables are included or just the assembly.
PRODUCT OVERVIEW
IBM BACKPLANE 4BAY 2.5 SFF FOR X3550 M3
IBM BACKPLANE 4BAY 2.5 SFF FOR X3550 M3. Key specifications include Drive Bays: 5x 2.5" SFF. The unit ships in a SFF form factor suitable for standard rack-mount installations.
Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.