PSA: If you don't have ATX bracket for your SFX PSU you're likely still could mount it in. For sure looks sketchy, but works surprisingly well (used it like that for months). :
Silverstone PP08 Universal SFX to ATX Power Supply Adapter Bracket Black SST-... 844761011161 | eBay
be quiet! SFX-L POWER 600W - 80 Plus Gold, Cable Management, SFX-to-ATX PSU, 3 Years Warranty
new SFX to ATX Convert Bracket with Screw power supply adapter Transfer bracket Aluminum alloy brushed free shipping 1pcs/lot|Computer Cables & Connectors| - AliExpress
Silverstone PP08 Universal SFX to ATX Power Supply Adapter Bracket, Black, SST-PP08B
Desktop Atx Power Supply Baffle Computer Small Chassis Sfx Power To Atx Bracket Matx Conversion Frame Black Silver - Pc Hardware Cables & Adapters - AliExpress
Corsair SFX to ATX PSU Adapter Bracket
Sfx To Atx Power Supply Adapter Bracket Pp08 Sfx/sfx-l Power Supply For Atx, Micro Atx And Mini-itx Chassis. - Pc Hardware Cables & Adapters - AliExpress
SilverStone Technology Universal ATX to SFX Power Supply Adapter Bracket in Blac 844761011161 | eBay
Sfx To Atx Power Supply Adapter Bracket Pp08 Sfx/sfx-l Power Supply For Atx, Micro Atx And Mini-itx Chassis. - Pc Hardware Cables & Adapters - AliExpress
NEW Silver SFX Power Supply to PS3/ATX PC Steel Mounting Bracket Plate – irdrive.com
Kingwin SFX to ATX Power Supply Adapter Bracket - Micro Center
CHICIRIS Atx To Sfx Power Supply Adapter Bracket, Convenient Atx Dual Power Supply Adapter, For Atx Power Benchtop Power - Walmart.com
Silverstone PP08 Universal SFX to ATX Power Supply Adapter Bracket, Black, SST-PP08B
File:SFX-ATX-PC Power Supply Adapter IMG 2124.JPG - Wikimedia Commons
SF Series™ SFX to ATX Adapter Bracket 2.0
Amazon.com: SilverStone Technology SFX to ATX Power Supply Adapter in Black PP08B-USA : Electronics
SF Series™ SFX to ATX Adapter Bracket 2.0
PP08
I forgot to buy the SFX to ATX PSU bracket, so now I'm stuck with this for the next two days. : r/sffpc
Tfx To Atx Power Supply Bracket For Tfx-atx Convert Position Baffle Apply Desktop Chassis - Pc Hardware Cables & Adapters - AliExpress