Screw size for retaining the chrome knobs on the dash

[Rob_Reilly]

I thought it was 2BA.

Screws fixing the windscreen wiper knob

I’m missing the screws to fix the knob of the windscreen wipers and the 2 knobs to control the heater tap and the speed of the fan of the delisted/defroster. Spare parts no 106891. Does anyone know the thread/length/head of this screws? and eventuality where to find/purchase? thanks Polti