Non-Genuine original type cable with black knob and the word 'Heater' embossed with white lettering as fitted to early Minis and Coopers before the introduction of the plastic safety feature type cables.
This is the Non-Genuine version which uses a plastic end as opposed to the Bakelite end of the original part.
The grommet in the body for the cable to pass through is
CAM5969 if the hole is 11/32"