NTC | FireWire 800/400, Panel Mount 9 Pin to 6 Pin Up Angle Cable
USB-C to FireWire 800 adapter doesn't exist, make our voices heard for one. - Gearspace.com
Newer Technology® : News Room : Press Release : NEWERTECH INTRODUCES FIREWIRE 800-400 ADAPTER FOR PLUG AND PLAY USE OF FIREWIRE 400 DEVICES WITH LATEST MACS
Pearstone 6-pin FireWire-400 to 9-pin FireWire-800 Adapter
OWC 1.0TB Mercury On-The-Go Pro FW800/400 + USB... at MacSales.com