Is that spacer supposed to replace the original centering sleeve or between the halves? If it's installed between there would be a gap between the spacer and front half where the bolts go thru and only lies on the center of the piece.

Edit: My mistake. It should fit flush. I remembered the front half structure wrong and added the third picture.

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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey