StarTech.com Thunderbolt 3 to FireWire Adapter - External PCI Enclosure - PCIe Card plus TB3 Chassis - The Thunderbolt 3 to 1394 FireWire adapter connects your FireWire peripherals to your Thunderbolt 3
3 Port Firewire 800 1394b+a PCIe Card Adapter Apple Mac Pro 1,1-5,1 7,1 *Big Sur | eBay
2 Port Firewire 800 +1 Port Firewire 400 (IEEE 1394b + 1394a) PCI Adap – local338
Amazon.com: Padarsey PCIe Firewire Card for Windows 10, IEEE 1394 PCI Express Controller 4 Ports(3 x 6 Pin and 1 x 4 Pin), 1394a Firewire 800 Adapter for Windows 7/8/Mac OS with