ThinkSystem ST50 V2 Internal Drive Cable Kit, contains:
1xSAS-to-4xSATA data cable, connects RAID/HBA to 3x SATA drives (SBB7A09984)
520mm SATA cable for drive bay 3 (SBB7A46040)
Power cable for drive bay 3 and the optical drive (SBB7A46041)
Power cable for drive bays 1 and 2 (SBB7A46039)
Tip: All HDD and SSD drive options include the 185mm SATA cable for use with drive bay 1 or bay 2. The 520mm SATA cable is needed for use with drive bay 3. 
Cables used in two scenarios:
When adding drives to a server with drive bays (cages) but without any drives installed
When upgrading from onboard SATA to an HBA or RAID adapter