Rear disc help on a 71 Mach 1?!?

We have a 71 Mustang Mach 1 at work with a 351C, 4 speed, and a 9" rear. The customer bought it on ebay being told it was in "perfect condition" but of course that wasn't the case. :lol: Anyway, the car has rear disc brakes on it with what looks like FRONT Cadillac calipers. Yes, that's right. There is no e-brake. I believe that we can put REAR calipers on the rear, but what cables do we need to attach the Cadillac calipers to the factory e-brake pedal? The customer would rather not buy an expensive rear disc kit when everything else works fine this way. Thanks for your help!
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