The main lights and inner tailgate lights will physicallu interchange across the entire E53 generation.

Visually the pre and post-facelift lenses have a subtly different lens pattern.

Function-wise IIRC you will have to do a re-pin, changing postion of a pin or 2. But I believe they have the same socket.

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04 X5 3.0i auto
03 X5 4.6is