Part 14 is the entire case extension. Part 7 is the seal. Did a seal come out, or was it actually a bearing? The bearing is not marked as a separate part in the diagram (and I do not think it is replaceable) but I recall that entire piece (the casting extension can be replaced that includes a new bearing) and for some reason I do not think it is crazy expensive. Less than $100 or so from some sources.

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2003 X5 Sport w/Premium Package M54 3.0L 6cyl