Guide to USB-C Pinout and Features - Technical Articles
USB 3.0 Header pinout diagram @ pinoutguide.com
LINKUP - USB 2.0 Female to USB 3.0 Male 20 Pin IDC Motherboard Header Active Compatible Converter Compatible Type C USB-C Chipset and Panel Mount
USB 3.0 20-Pin Right Angle Male IDC Connector Box Header PCB Connector MDY-CO234
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I can't be the last one to know this. Facts about internal USB headers : r/buildapc
Amazon.com: LINKUP - USB 3.2 Gen 2x2 20Gbps USB-C Type Internal Panel Cable Mount Motherboard Header Extension Adapter┃20-Pin A-Key Male with Cover to USB-C Female Connector with PCI Bracket - 40cm :
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USB 3.0 19-Pin / 20-Pin IDC Male Internal Connector - FrozenCPU.com