100pcs/lot 10cm/20cm 5.25" 4 Pin Molex To 3.5" Floppy Drive FDD Internal Power Adaptor Cable black - AliExpress
BYTECC Bracket-35525 3.5" Mounting Bracket Universal Adaptor For 5.25" Drive Bay or Enclosure - Newegg.com
SATA/IDE to USB 3.0 Adapter, External Hard Drive Reader for Universal 2.5/ 3.5 Inch IDE
Teac CS-235R 5.25” Adaptor Kit for 3.5”MICRO FDD | eBay
3.5 Inch To 5.25 Inch Hdd Hard Disk Drive Rack Bay Converter Desktop Pc Case Mounting Bracket Adaptor Kit Aqjg - Pc Hardware Cables & Adapters - AliExpress
Bytecc 35525 3.5" H.D.D. Mounting Adaptor For 5.25" Drive Bay or Enclosure 837281104000 | eBay
StarTech.com 3.5" to 5.25" Front Bay Mounting Bracket w/ Mounting Screws (BRACKETFDBK)