Aluminum 4 Bay Internal Mobile Rack For 3.5 Inch Hdd Tray-less Sata Iii Hard Drive Backplane Enclosure To 3x 5.25" Drive Bay - Ssd Adapters - AliExpress
Amazon.co.jp: Gtooely 4 Bay, High Capacity HDD Hard Drive Cage Rack, 5", 3x Optical Drive Bay to 3.5" SATA Hard Drive Tray Caddy : Computers
Max 3504 SATA HDD Rack
Amazon.co.jp: 5.25 ?5x 3.5 SATA SAS HDD Cage Rack Hard Drive Tray Caddy Converter with Fan Space : Computers
Hard Drive 3.5" HDD Holder Disk Test Bench Case Bracket Rack DIY Enclosure Set | eBay
tssuouriy Mobile Rack Enclosure Hard Disk 3.5-Inch Or 2.5-Inch HDD Hot Swap Enclosure Rack Data Storage Durable External Drives DIY HDD ra No.3 | Walmart Canada
Amazon.co.jp: Coa 3.5" HDD Hard Drive Cage, 5X3.5" HDD Cage Rack, For BTC Mining Computer Storage Expansion, DIY Hard Disk Box : Computers
I created a 3D printable hard drive rack for those that have hard drives with no case to put them in : r/DataHoarder