USB 3.1 Type-A & Type C MAC PRO PCIe Card - Plug and Play!! Supports 3,1 4,1 5,1 | eBay
USB Type-C to HDMI Adapter
Delock PCI Express Card > 1 x external USB Type-C™ 3.1 female + 1 x external USB Type-C™ 3.1 (DP Alt Mode) female
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SUNIX IT USB 3.1 Dual Port USB-C PCI Express (w/Alternate-Mode) (UPD2018) : Electronics - Amazon.com
Delock Products 62990 Delock Adapter USB Type-C™ male > mini DisplayPort female (DP Alt Mode) 4K 60 Hz with PD function
DELOCK 89582: PCIe > USB 3.1 C socket + USB-C DP Alt mode at reichelt elektronik
Alternate Mode for USB Type-C™: Going Beyond USB
Startech .com 5-Port USB PCIe Card, 10Gbps USB 3.1 Gen 2 PCIe Card, 1 USB-C/2 USB-A, Internal Header (2x 5Gbps USB), USB C PCI Express Car... PEXUSB312A1C1H - Corporate Armor
SUNIX USB 3.1 10G & DisplayPort Alt-Mode PCI Express Host Card with Dual USB Type-C Receptacles (Gen2) Model UPD2018 Add-On Cards - Newegg.com
USB Type-C: What You Need to Know
Add USB-C with DisplayPort-alt-mode to your PC – Dan S. Charlton
SUNIX – Support
StarTech.com 5-Port USB PCIe Card - 10Gbps USB 3.1 Gen 2 PCIe Card - 1 USB-C/2 USB-A/Internal Header - PEXUSB312A1C1H - Storage Mounts & Enclosures - CDW.com
Install an inexpensive USB-C PCI-E card in a Mac Pro for full USB 3.1 data transfer speeds | AppleInsider
Intel Announces Thunderbolt 3 - Thunderbolt Meets USB (At Last)
SUNIX - USB 3.2/3.0/2.0
USB-C to DisplayPort 8K Cable (2M/6.56FT) - UPTab
Amazon.com: PCI Express to 2X USB 3.1 GEN2 Type C 10Gbps Ports Card for Windows 7, 8.1, 10, 11 (32/64) and MAC OS 10.9,10.10,10.12,10.13,10.14,10.15 PCs, Built in Smart Power Control Technology (PCE-U312C) : Electronics