USB 2.0 A Male to Firewire IEEE 1394 6P Female Adaptor Converter Connector F/M - Newegg.com
White IEEE 1394 IEEE1394 6PIN Female to 1394b 9PIN male Firewire 400 TO 800 Adapter Cable 10cm 0.1m|ieee 1394|firewire 400 to 800firewire 400 - AliExpress
Amazon.com: Blacell USB 2.0 A Male to Firewire IEEE 1394 6P Female Adaptor Converter Connector F/M : Electronics
OWC Mercury Elite Pro FireWire, eSATA, USB3 to SATA 0GB Enclosure
FireWire 400, 1394a, 6 Pin Male to 4 Pin Male Cable, Black, 6' — Tera Grand
Thunderbolt 3 to FireWire Adapter - FireWire Adapters | StarTech.com