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Internal USB header cable, 2.54mm pitch 18" length | OnLogic
18' USB IDC Motherboard Header Cable M/F - Internal USB Cables & Panel Mount USB Cables | StarTech.com
FRONTX - USB Internal Cable - connect to motherboard header (pinout)
Amazon.com: Motherboard USB 9 Pin Header Hub Male 1 to 2/4 Female USB 2.0 Splitter Extension Cable, USB 9-pin Internal Cable 9 pin Connector Adapter for Port Multiplier (35cm) : Electronics
I can't be the last one to know this. Facts about internal USB headers : r/buildapc
usb - why USB3 motherbard headers have so many unused pins? - Super User
USB to MotherBoard 4-Pin Slot -- DataPro
FRONTX - Mother-board USB Pin Assignment - USB Header (pinout) Connection Guide
USB header pinout, connecting a poorly marked cable - Electrical Engineering Stack Exchange
Motherboard USB Ports
FRONTX - Mother-board USB Pin Assignment - USB Header (pinout) Connection Guide