This kind of thing can be found at MAX BMW parts fiche, and a whole lot more: https://shop.maxbmw.com/fiche/PartsFiche.aspx
Find the screw and go to the description, it will tell you the size.
If the screws are hosed, the well nuts are likely equally bad and will just mess up the screw threads again. I would buy new screws and well nuts for every location giving trouble.
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