System Drive: 1x 2.5-Inch Internal Drive - Part Number MCP-220-84603-0N - $7.29

System Drives: 2x 2.5-Inch Internal Drive - Part Number MCP-220-84606-0N - $39.99

Hot Swap: 2.5“ into 3.5” Hot-Swap HDD Tray - Part Number MCP-220-00043-0N - $12.15

Mount for 2x 2.5-Inch Internal Hot-Swap Drives - Part Number MCP-220-82609-0N - $48.50

http://www.supermicro.com/products/chassis/mobilerack/

4x 2.5“ Hot-Swap into 5.25” External Drive Bay - Part Number CSE-M14TB - $78.91

http://www.supermicro.com/products/accessories/mobilerack/CSE-M14.cfm

SILVERSTONE SDP08 3.5 to 2 X 2.5-Inch Bay Converter - $12.99

http://www.newegg.com/Product/Product.aspx?Item=N82E16817997007

All need verification and testing in Supermicro servers.

Vantec NexStar SE MRK-510ST - $12.99

http://www.newegg.com/Product/Product.aspx?Item=N82E16817986005

Silverstone SDP09 6Gbps 2.5“ SATA HDD/SSD Adapter for 3.5” Hot-Swap Drive Bay - $20.99

http://www.newegg.com/Product/Product.aspx?Item=N82E16817997023

IcyDock MB982SP-1S Full Metal 2.5“ to 3.5” SATA HDD & SSD Converter - $28.99

http://www.newegg.com/Product/Product.aspx?Item=N82E16817994121