Need replacement cables for old compound bow, can you help?

I have an old 1991 or so Barnett safari compound bow and I broke the cable on it. The string is new but I am having a very hard time finding the cables as the Barnett company has switched to crossbows and no longer carries the cables. I have taken it to many archery shops and they all say they cannot help me and the design is obsolete. I agree but this bow means alot to me as it was given to me by my father when it was new. I can also shoot the eye out of a bird flying with it. The cable is about 8 inches long or so and is metal stranded with plastic covering, also one end is rectangle (around 1/2 long 3/8 wide) the other is heart shaped as the bow string attaches to it. The rectangle end goes in the cam. Please help, any ideas?