I have the long cable the comes from the parking brake actuator in the dash and that runs down the length of the underside of car and terminates in a threaded rod about 5-6 inches long near the differential.
Is that cable attached to the frame on the drivers side? If so, you could probably use C-body rear cables where the passenger side rear cable is long and crosses over the rear axle and terminates on a bracket on the passenger side frame; the driver side rear cable is shorter and terminates on the same bracket. An equalizer bar connects the two rear cable ends and attaches to the threaded end on the front cable.
