Update:

To get myself familiar with the vacuum stuff, I took a look at the trunk and the fuel door ones.

The vacuum elements look like a tube don't they?
The diaphrams are the red rubber thing that looks like it seals the tank and whatever shaft or line runs through it, aren't they?

I also noticed those rubber lines. Are they available in any auto store? Because I looked in Fastlane and I couldn't find anything...
I guess I also saw the 'tee's in the trunk vacuum element.

It doesn't look that hard to fix. I have ordered the diaphrams from Fastlane and when they arrive, I'll just get working on it (I have a rather easy week coming up, which is good for the 300CD)

I can't believe that a shop quoted me $560 to replace all the diaphrams... I'd be rich if I could make $400 just installing diaphrams... (if i know how to do it)

I hope I can fix it myself.. otherwise I'll just bring the diaphrams to a shop and ask 'em to install 'em for me.

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2008 BMW 335i Coupe