Bytecc 2.5" Superspeed USB 3.0 & FireWire 800 to SATA Mobile (HD7-U3FW800)
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
Amazon.com: OWC Mercury On-The-Go Portable 2.5" FW800/USB3.0 Enclosure Kit for Serial ATA (SATA) : Electronics
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OWC Mercury Elite Pro mini USB 3.0 + FW800/400... at MacSales.com
Macally 2.5" USB 3.0 / FireWire 800 Aluminum Hard PHR-S250U3B
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3.5 Drive Enclosure - USB, Firewire, eSATA
External Hard Drive Enclosure | USB 3.0 | SATA3 | MacMemory.com