ORICO 3.5 inch 5.25 Bay Stainless Internal Hard Drive Mounting Bracket Adapter
Computer Hardware Services N.V. - Sabrent 3.5" to 2 x 2.5" HDD/SSD Bay Converter
Plastic & Steel 4 Bays SSD Protect Box For 2.5" 3.5" SATA SAS IDE HDD enclosure Case 4-bay external SSD docking station - AliExpress
2.5" Drives in 3.5" Drive Bays - drive adapter options
Startech Dual-Bay 2.5" to 3.5" SATA Hard Drive Adapter Enclosure with RAID | PLE Computers
Akasa 3.5" Device/SSD/HDD Adapter | 5.25" to 3.5" Bay Adapter | 2.5/3.5 Inch Hard Drive Enclosure | SSD Mounting Bracket | For 5.25 inch PC front Bay | AK-HDA-05 : Amazon.co.uk: Everything Else
StarTech.com USB 3.0 / eSATA Dual-Bay Trayless 3.5" SATA III Hard Drive Enclosure with UASP - 2-Bay SATA 6 Gbps Hot-Swap HDD Enclosure - Connect two hot-swappable 3.5" SATA III hard drives
Hard Drive Accessories - Sabrent
Single Bay 2.5”/3.5” HDD Cage for COSMOS C700 Series | Cooler Master