Thank you to @Qsilver7 and @Mackskibum! The diagram didn't really show what I was looking at under the hood. The one from bmwfans.info actually looks closer than the one from realOEM. I suppose I need all three parts. Anyone replaced these before?

@Qsilver7, also appreciate the advice on the posting and signature. Sorry about that.

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2008 X5 3.0si