I did contact ECS and they said they are looking into a possible wrong part. So far they have only sent me a return procedure, but I don't want to return it.
They did confirm that the M3 and the Z4M S54 engines are the same.
I don't know what is going on exactly, but I know one thing for sure. I will never put that stock plastic dipstick in my car ever again. That end snapping off scared the crap out of me.
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