Amazon.com: axGear 2.5/3.5 to 5.25 Drive Bay Computer Case Adapter HDD Mounting Bracket SSD : Everything Else
Amazon.com: DEEDRR Alloy Steel Hard Drive Cage for Computer SATA 5.25in to 5X3.5 Inch,Cage Hard Drive Tray Rack with Fan Space,Adapter Rack Bracket with ABS Plastic
StarTech.com 5.25" to 3.5" Hard Drive Hot Swap Bay for 3.5" SATA (HSB1SATSASBA)
Seagate: 5.25-inch hard disk drives could return to datacentres | KitGuru
M2949SYU – Fujitsu 9.1GB 7200 RPM SCSI 5.25″ HDD 50 pin – Disk Drive Finder
Universal 5.25" Open or 3.5" HDD to 3.5" HDD or 2.5" Multiple HDD Bracket HDD-25-35
5.25" Bay Drive Tray Less Security Lock Mobile Rack for 3.5" and 2.5" SATA III HDD with extra 2 port USB 3.0
1980: Seagate 5.25-inch HDD becomes PC standard | The Storage Engine | Computer History Museum
iStarUSA Trayless 2 x 5.25" Drive Bay to 3 x 3.5"
USB 2.0 to IDE / SATA Adapter, Works with 2.5/3.5/5.25 HDD - Coolgear
ORICO 5.25 Tray-less Hot Swap Mobile Rack CD-ROM 3.5 inch Internal SATA Hard Drive SSD Adapter-1106SS - Newegg.com