M12x1,0 mm nipple on front left side connection only. (The point where those lines could be mixed.) Others should be M10x1,0 mm. If those old nipples are not badly corroded you can reuse them but of course preferably renew them too.
https://www.realoem.com/bmw/enUS/sho...diagId=34_0980
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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
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