If you need to add a panel-mount connection for USB C, but don't have the time or tools to cut a custom oval or square hole, this Round Panel Mount
USB C Jack to USB C Jack Round Panel Mount Adapter
Adafruit Industries - 4260 - USB C Jack to Micro USB Jack Round Panel Mount Adapter - RS
If you need to add a panel-mount connection for USB B, but don't have the time or tools to cut a custom oval or square hole, this Round Panel Mount
USB B Jack to USB A Jack Round Panel Mount Adapter
New Round Type Chassis Connector USB Type C Female to PCB Board Pass Through Adapter Type-C Panel Mount DIY Jack with Dust Cover - AliExpress
Adafruit USB C Jack to USB A Jack Round Panel Mount Adapter - 4259: : Industrial & Scientific
DIY USB Type C Socket Panel Mount Chassis Power Adapter OTG Male Jack USB-C 3.1
22mm USB connector socket Panel mount round hole USB-C TYPE socket/connector/USB C Female to Male - AliExpress
Panel Mount USB C to USB a Jack Adapter - China USB C Jack to USB a Jack Adapter, Panel Mount USB C Jack to USB a Jack Adapter
USB C Jack to Micro USB Jack Round Panel Mount Adapter - Learning Developments
If you need to add a panel-mount connection for USB C, but don't have the time or tools to cut a custom oval or square hole, this Round Panel Mount Plug is the easiest and fastest way to panel-ify your project. It's about 30mm in diameter, so you can drill a hole in your wood, plastic or metal with a common hole-saw or bit, no special shapes or filing required. Un-screw the plastic nut, insert the plug and re-attach.
adafruit-USB C Jack to USB A Jack Round Panel Mount Adapter
USB C Jack to USB C Jack Round Panel Mount Bulkhead Adapter
USB C Round Panel Mount Extension Cable : ID 4218 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
USB C Jack to Micro USB Jack Round Panel Mount Adapter - Boutique Semageek