Name these parts... trying to fix leaks
 

2005 X5 4.8is, 70k miles. I've changed my leaking oil pressure switch and after that noticed that there is still a leak (or two) somewhere. Pictures were taken on the passenger side with me laying on the ground and looking up. Picture 2 is the close up version of picture 1.

Questions:
1. What is the shiny round part that has some oil on it (labeled #1)?
2. What is the hose that seems to have a leak (labeled #2), is it power steering?
3. Any idea where the oil drip labeled #3 could be coming from?
4. And finally, is that the transmission oil cooler labeled as #4, and if so, anyone know the part #?

Thanks in advance all!

#1 is the belt idle pulley and seen like the oil is drip from the hose in #2.

Yeah looks like #1 is dripping on #2

Also im not too sure on this but i think those hoses have been replaced already ...

Thanks guys. I'll check/confirm if #2 is in the path of #1 dripping.
Any ideas where the leak could be coming from that would create those oil drops on #1 and #3?
And pezho405, why do you think those hoses might have been replaced already?

Im not too sure because i never paid much attention to it but the writing on those hoses seems non oem like. Just a funny feeling. i may be wrong though, but ill take a look at them and report back

So you took time to post this link, why? Do you know the parts that I am asking about? Yes, it is most likely somewhere in those drawings, but if I knew what to look for I would not post a question. And yes, I have been using RealOEM for quite some time now.
This is like my kid asking why the sky is blue and I give him a 5000 page encyclopedia to find an answer.
Please post useful info if you have it. If you do not, just move on....

Careful now. darks is just trying to help. the exploded views of realoem sometimes help the user trace where hoses connect and give parts actual names instead of numbers pasted onto a photo.

Sorry, Roadkill, but with all due respect I disagree. That was not help at all - posting a link to RealOEM? Really?
Yes, it would help if I knew where to look to start with. That is why mrbmwx5's post helps because he knows that #1 is the belt idle pulley.
On the other hand, if epdarks knew what the hose is and said something like, look up hoses in "Steering -> Lubrication System -> Hydro Steering-Oil Pipes" in RealOEM, that would be help because he would tell me that those are power steering hoses...

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?