Omega Seamaster Cosmic ST 166.0045 crown lost. Pls help

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Hello,

I discovered today that the crown of my Seamaster cosmic fell off. Went to the watchmaker who serviced it and unfortunately, he has no spare. I was told I am looking for 2 parts and we are now both trying to source it. The crown and another thing that goes over the axis. That part's box from Omega says 081ST7099349/02 or 081ST7999349/02. The first digit after the T is not legible. Crown part no. I was told 43014 or 43210.

Does anyone have any idea what crown part I am looking for and where can I source them ?
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