I just used the original screws, you unscrew the original 4 to release the bracket, use 2 to fit the damper to the stepper, and 2 to refit the bracket to the damper.
I ordered these, they will be in this week so i know if they fit.
The axel for the top bearing is +/-4.5mm but the original bearing has a 5mm hole?
It held in between 2 plastic flanges and has an odd size, so i hope i can find a way to make it fit easily.
I ordered the one with 20 teeth, in my mind it is the lack of teeth that is creating the noise right now,
Already did the linear bearings in april, but you are right, it will be the perfect moment.