the problem with Bear and Z end stops is that it is not possible to have them at the same hight, no problem with original MK3S frame or Zaribo. The new Z end stops are missing 1mm to alight with the frame end. Eery one will have same issue as I have but not everyone checks the bed level
I've partially fix the issue with the Z end stop by raising it 1mm to be flush with the Z beam end. Still far from perfect but now Z left and right are more or less at the same hight.
you have to mirror the part to have both, left and right, this is the right Z stop.