I have managed to install this mod on Biqu B1, but I had to do some adaptations:
1. 1_RightV3.7 - modified the location of the bolt from inside - it was 0.5 mm closer to the extrusion
2. the Bottom part I also modified it so it can be mounted on the extrusios
3. I fixed the Z-endstop switch using the left screw of the clamp mounted on the left plate, right close to the extruder.
4. I fixed the screw used for Z-endstop, using the right screw from the bottom part, but I had to add around 4 washers to be aligned to the switch.
I have used the kit from Aliexpress, and it was a very good fit.