Amazon.com: Fanblack 7 Ports PCI-E to USB 3.0 Expansion Card (4 USB A and 3 USB C Ports), Internal Converter PCI Express Expansion Card for Desktop PC, Works with Win/Linux/Hackintosh/Proxmox/MAC OS :
PM4F-U3A (mini card Rev 2.1 to PCIe Adapter)
Amazon.com: ADT-Link PCIe 4.0 x16 x8 x4 Male to x16 Female Riser Extension Adapter Heightened Test Protection Card (R23A-ADT) : Electronics
PCIe x16 Extension Cable
xprs-pci-x3 - XPRS PCI 3 connectors card
ASUS TUF Gaming X3 GeForce GTX 1660 SUPER TUF 3-GTX1660S-O6G-GAMING Video Card - Newegg.com