w201 320cdi cranshaft position sensor replacement. What size socket?

[ChipChop]

Sorry meant w210 crankshaft position sensor.

Does anyone know the socket size needed to remove the crankshaft position sensor on an s210 320 cdi om613.

Am i correct in thinking access if from the passenger side engine bay, back of engine bellhousing area.

 

[carat 3.6]

Iirc 5 or 5.5mm hex key.