Pearstone 6-pin FireWire-400 to 9-pin FireWire-800 Adapter
AK FW 9P-6P 4,5M: Firewire cable, 9-pin plug, 6-pin plug, 5.0 m at reichelt elektronik
6 Pin Firewire to Thunderbolt - Apple Community
Amazon.com: Pasow FireWire 800 to 400 9 to 6 pin Cable (9pin 6pin) 6FT, IEEE 1394 Firewire 800 9-pin/6-pin Cable 6 Feet(9 pin to 6 pin) : Electronics
Amazon.com: Xiwai 1394a 6 Pin to 6Pin FireWire 400 to FireWire 400 6-6 ilink Cable IEEE 1394 1.8m : Electronics
Amazon.com: Cmple - 15FT FireWire IEEE 1394 Cable/iLink 6 Pin to 4 Pin Male to Male DV Cable 4-Pin to 6-Pin FireWire Cable Cord - 15 Feet Black : Electronics
4.5m Premium FireWire 800 Cable - 6 Pin Male to 9 Pin Bilingual Male - from LINDY UK