ac knob 350sl 1973

In my 350SL ( USA) from 1973 is an AC unit
However the knob, to operate it, is missing.
It should be screwed in.
Who has it or knows where to get it ?
A picture of the little plate behind the knob is at http://www.ampl.nl/ac
Thanks Hennie Holland
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You are missing two pieces: The ferrule that screws in and the knob that pushes in.

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