Firewire to IDE/SATA/mini

I know this may not be in the right section. I refuse to post in the Mac section as I've never gotten anything useful there.

I'm looking for a firewire Connector cable. NOT an external drive bay. I work on a lot of older Macs and would love to store my OS disks on older drives to boot from. Also faster transfers from failed ibooks to new systems would be another plus. I've googled until my fingers are raw, and haven't found what I want. USB I can get by the truck load. Please only post if you can point me to where these exist, or can tell me why they don't exist.
Thanks