A little rust, one small kink and your original cable is shot !
These quality steel cables will bring new life to the operation of your heater.
Danchuk # 463 will work on any 1956 classic Chevy model.
See the 2nd photo for all of the other parts you may need when restoring or repairing your heater:
#612 Control Knobs
#466 Control Levers
#014 Control Valve
#1036A Deluxe Fastener Set
#15547 Replacement Lever Pin