lights switch

Hi E9ers, Does anyone know where i can source the main Headlight switch 61311350151 which also doubles up as the Instrument cluster dimmer. I screwed up when I used the Realeom site to find ( what i thought was ) the correct part No ( 61311355791 ) only to see that it has the wrong pin outs...

First of all I want to introduce myself. My name is Carlos, I am from Madrid, Spain and a car lover since I was very young. My father took me to be born in a BMW 2800 cs of the year 1971. I have been keeping the car in garages, industrial buildings and even chicken coops for the last 20 years...