As much as I liked it, firewire is now a
"technology fading off into the sunset".
I'd suggest you get USB3 enclosures instead.
They'll be just as fast, and are backward-compatible with USB2 as well.
If any of your drives are 2.5", this might be a good enclosure:
SABRENT 2.5 Inch SATA to USB 3.0 Tool Free External Hard Drive Enclosure [Optimized for SSD, Support UASP SATA III] Black (EC-UASP)
tinyurl.com