8_4 igus style by 3drap file turns out to be fitting perfectly
Printer: Anet A8 07.2017
I used Simplify3d with Middle settings.
The Bearing does make a sound when sliding back and forth by hand, I am printing the third one so I can test it on the X Axis.
I changed the lower bearing of the extruder and I hear a difference in sound already.
Be carefull when removing the original one, I used the pliers that came with my Anet A8, slightly damaging them.