DELL 3.5" TO 2.5" SSD HARD DOUBLE DRIVE ADAPTER WITH SCREWS 0R494D F767D J132D
Genuine DELL 3.5" to 2.5" SSD HDD Caddy Adapter Tray with Screws 0R494D F767D J132D. Dell part number : DR494D/0DR494D. (It is possible to actually fit two 2.5" drives to this caddy - although there are only four screws included).