You do not have a 'B' version, so unfortunately no option for dual rear hot-swap (only slimline optical drive, which gets you single hot-swap at best with an adapter). You can still use the two internal 3.5" mounts though. MCP-220-84601-0N is the bracket required to mount 3.5" drives. They're only $5ish each. Then you'll need a 3.5" to 2.5" (or dual 2.5") adapter for each of the spots (doesn't have to be Supermicro SKU).