ThinkSystem SR250 V2 X30/X40 RAID Cable Kit 3x SAS cables, X350 RAID to Backplane (SBB7A10039, feature B415) 1x SAS cables, X40 RAID to Backplane (SBB7A50176, feature BM7M) 1x SAS cables, X40 RAID to Backplane, Y-cable (SBB7A46060, feature BMX3)