StarTech.com 4-port PCI Express LP USB Adapter Card - Add 4 USB 2.0 ports to your low profile/small form factor computer through a PCI Express expansion slot - pci express usb 2.0
Amazon.com: StarTech.com PCI Express to PCI Adapter Card - PCIe to PCI Converter Adapter with Low Profile / Half-Height Bracket (PEX1PCI1) : Electronics
Can an external PCI-Express to PCI adapter work? Sort of... - YouTube
PCI Express to PCI Adapter | 5 Min Tech Test - YouTube