I canīt tell from your photo if you have this or not: a plastic piece that slides into the plastic knob to hold together the knob and L shaped lever for changing the mirror position.

You also need the retainer that snaps into a hole in the door behind the triangle shaped chrome plastic cover. This cover has an ear on the back that snaps into the retainer. Itīs very small, cheap, and available from the dealer.

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Don't Chrome them; polish them