Did the aux install a few weeks ago, the link was pretty much spot on. Thanks to Steve for posting that up BTW.

My radio mounting screws were in a slightly different area than marked but in the same general location.

As mentioned there is a fuse location guide in the fuse box housings, or you can just pull the exact same fuses as in the pics.

I installed mine in the ash tray. There is a hole in the left of the ash tray frame, and the ash tray itself has a plastic diffuser on the left which I removed so the cable can enter the tray

Just drop the cable down from the radio opening and fish it out through the ash tray frame hole. I opted not to remove the climate control switch assy but it would be easier if you did.

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04 X5 3.0i auto
03 X5 4.6is