IBM - 43W5575 - HDD Backplane 3.5" SAS 43W5575 - IBM - 3.5 SAS HDD Backplane BOARD for System x3650 $86.98 $73.71
IBM - 44X4104 - HDD Backplane 4x 2.5" 12Gb SAS 44X4104 - IBM - 4X 2.5-inch HS 12GB SAS HDD Backplane System x3850 X6 $237.30 $201.10
IBM - 90Y5875 - HDD Backplane 8-Bay 2.5" SAS RAID 90Y5875 - IBM - 8X 2.5-inch HS SAS HDD Backplane with RAID EXPANSION for System x3650 M4 $528.35 $447.75