A friend of mine is looking for a heater control cable for his 1964 Riviera, without a/c. This is the cable that goes from the bellcrank inside the dash center to the black plastic "clam shell" box on the engine side of the firewall. This cable and subsequent linkage operates the water control valve that governs the flow of water into the heater core.

Can someone please tell us the color code of the plastic tag on the dash end of this heater cable, AND its length? Thank you very much for any help. John