Similar issue: Replaced the engine mounts and tranny mount, still vibrated. I did have to replace both front drive shafts and flex discs. Now the vib is very, very slight. However, one mechanic stated it's an idle issue; to low. Than someone stated Torque Converter, but my tran is smooth n sweet. Not sure what it is but I just live with it now. Let us know what you find. BTW, my engine mounts were oil filled and had leaked while sitting for 6 months.

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X5 3.0 AUTO -2001 - 238,000 miles