This adapter mount converts either 2.5 or 3.5 HDD to fit on PCI/ PCI-e slot. If drive bay is fully occupied, this bracket is suitable for you and
Metal Pci Slot 2.5inch Ide/sata/ssd/hdd Rear Panel Mount Bracket Hard Drive Adapter Tray Caddy With Sata Data Cable - Pc Hardware Cables & Adapters - AliExpress
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JMT Metal PCI Slot 2.5inch IDE/SATA/SSD/HDD Mounting Bracket Rear Panel Mount Bracket Hard Drive Adapter Tray Caddy with Sata Data Cable (Full Height Bracket) : Electronics