This product is either discontinued or we cannot get that from suppliers.
Qnap SP-TS-TRAY-GOLD HDD Tray Without Key (Gold), Expansion Bays 1 x internal - 2.5" / 3.5" shared, Hard Drive Form Factor Compatibility 2.5" / 3.5" shared, Device Storage drive carrier (caddy).
Qnap HDD Tray for TVS-x63 series, gold, metal (SP-TS-TRAY-GOLD).