part 3 is definitely dripping onto parts 1/2. these views are from underneith and the oil drop on bottom of the bolt head shows that the oil must be coming from the top side (or even higher placed part) than what part 3 IS.
OP, did you ever find the source?

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S