Tera Grand FireWire 400 1394a 6-Pin Male to 1394a 1394-6P4PK-10
Connect old Firewire hard drive to modern USB-C Mac
Amazon.com: elago FireWire 400 to 800 Adapter (Black) : Electronics
Amazon.com: elago FireWire 400 to 800 Adapter (White) for Mac Pro, MacBook Pro, Mac Mini, iMac and All Other Computers : Electronics
Amazon.com: 4 Pieces Firewire IEEE 1394 6 Pin USB Adapter Female F to USB M Male Cable Converter Firewire 6 Pin to Male USB 2.0 Adapter for Printer, Digital Camera, Scanner, Hard Disk : Electronics