Yeh it looks pretty rough. My arm would not spin freely anymore. But it is still giving me the self level error and the code is coming up with the right sensor. i checked the pins and they are not rusted so im not sure :/

Part number 6 778 812 superceeds all the older part numbers which is why you got that one, which is the same one i ordered.

I might be interested in that bmw info, i'll let you know. ty.