I just checked the manuals for some pretty old One For All and Radio Shack remotes, and they all list 2 or 3 of the following codes for Fisher: 0042, 0219 and 0360.
The good news is that all three codes are present in the current Radio Shack and One For All remotes (I checked the RS 15-2116 and the OFA URC-8811 series).
So, I think going that route is your best bet.
Rob
http://www.hifi-remote.com