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5.25'' to 3.5''/ 2.5'' Bay Adapter 5.25 FloppyDrive to Dual 2.5 x 3.5 HDD/SSD Bay Cover Computer Mounting Bracket Kit Supports 7mm 15mm 2.5inch HDD for PC. : Electronics

HDD Hard Drive Metal Mounting Bracket Adapter, Convert Any 3.5 in HDD Into One 5.25 in Drive Bay（1x3.5 to 5.25 in） : Electronics

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SSD/HDD Metal Mounting Bracket, Convert Any 3.5 inch Solid State Drive/HDD Into One 5.25 inch Drive Bay (3x2.5 SSD/HDD to 5.25 Metal) : Electronics

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5.25 to 3.5 Bracket Holder Hard Disk Drive Metal Bay Adapter w/ Screw 3 Sets

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HDD Hard Drive Metal Mounting Bracket Adapter, Convert Any 3.5 in HDD Into One 5.25 in Drive Bay（1x3.5 to 5.25 in） : Electronics

ORICO Aluminum 5.25 inch to 2.5 or 3.5 inch Hard Drive HDD SSD Converter Adapter Mounting Bracket Hard Drive Cage - AliExpress

2.5 TO 3.5 HDD SSD Mounting Bracket Adapter Rack Dock Tray Hard Drive Bay for $17.87 - PicClick AU

3.5 HDD Hard Drive Mounting Bracket Adapter for 5.25 Bay, Convert 3.5 Inch HDD Into One 5.25 Inch Drive Bay (2 Pack) : Electronics