Since I'm in the middle of my suspension including dampers, springs, bearings, crossbars, track rods/heads, etc. I have read that the central screw of the wheel hub (for attaching the drive shaft to the VA) is best also to be renewed. Is it necessary? If so, I still need the part number.
Could someone pick out these? Someone would be so sweet.

Furthermore, I had to find out yesterday with horror that the front left brake caliper (Ufo brake system) was only held to one, yes exactly, to a screw. How did I not know that they could be dissolved?
Nevertheless, I also wanted to renew this screw and need the subnumbers, could someone also pick out for me?
Thank you very much in advance.
