I'm kinda stuck.
They want me to compress the spring by 3mm on the lower spring seat, but I don't know from where? I can loosen the top and take that 3mm off. The top is not all the way tight yet anyway. When I tighten the top, it will compress the spring a lot further anyway. So I guess I just make them the same on each side and try it?
The rears were already at a certain ride height. The fronts apperently are not.