I used FAG bearings in my X5 with great success, also using the harbour freight press and bearing puller! I also had a wicked shimmy between 60km/h and 100km/h, i suspected the front tire was out of balance, (steering wheel had a distinct feeling and shimmy) rotated front tire to back, and the shimmy was now in my seat! not the steering wheel, that was confirmation to me that my tire was out of balance. brought it to my favorite tire shop, where they balanced it and remounted the wheel for me for a crisp $20 bill! all is good now!
make certain its not the tire delaminating or something like that. i even went so far as to use a dial indicator to see if i had a bent rim or out of round tire!!
good luck

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2003 X5 3.0i (02/2003) sport package, Sapphire black metallic / Black Dakota Sport seats. compass mirror retrofit, trailer hitch retrofit, Prodigy P2 trailer brake controller installed, PDC retrofit, Lumbar support retrofit. heated rear seats retrofitted. Running boards retrofitted and subwoofer install in progress. 4.8is Brakes installed front and back. Bluetooth TCU installed, Rear Fog lights installed. Retrofitted reclining rear seat backs.