This product is either discontinued or we cannot get that from suppliers.
Tgc Chassis Accessory TGC-02A, Supporting 3.5" HDD convert to 2.5" HDD (Max able to 2* 2.5" HDD), Server Case, Silver.
TGC Chassis Accessory 1 x 3.5' to 2 x 2.5' HDD/SSD Tray Converter Silver.