This modular flex atx psu fits the velka 3 btw : r/sffpc
mini-itx.com: Silverstone FX350-G 80 PLUS GOLD Flex-ATX PSU psu
Final Words & Conclusion - The SilverStone FX500 Flex-ATX 500W PSU Review: Small Power Supply With a Big Bark
Bracket SATA Port-M/H (1-Port) FLEX-ATX - Cablematic
SilverStone
Flex ATX Power Supply Mounting Bracket for DIY Projects LED - Etsy
Flex 600w Modular Power Supply Small 1u Computer Psu Flex-atx 500w For Itx Mini Pc Active Pfc For Pos Aio Desktop 110v 220v - Pc Power Supplies - AliExpress
FSP FlexGURU 300W Flex ATX Power Supply Review | TweakTown
Amazon.com: FSP Group Mini ITX Solution/Flex ATX 80 Plus Gold 400W high Efficiency Power Supply (FSP400-60FGGBA) : Electronics
Amazon.com: SilverStone Technology 350 Watt Flex ATX Power Supply with Fixed Cables and 80 Plus Gold with 6Pin PCIe Connector SST-FX350-G-USA : Electronics
File:SFX-ATX-PC Power Supply Adapter IMG 2124.JPG - Wikimedia Commons