Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3959782.
This is specific to the Ender 3, Ender 3 Pro, currently some BMG cloned extruders conflict with the Z screw and therefore cannot be used unless mounted with an additional angle bracket.
This is a simple wedge fillet or spacer that will offset the mounting of a BMG Clone extruder by 4 degrees allowing it to be mounted to the stepper motor in the correct orientation without an additional angle bracket.
Although a simple solution you will need 3 x M3 x 40mm machine head hex bolts has the stock bolts that come with the cloned extruders will be too short.
The gear that is fastened to the stepper motor needs to be moved another 6mm so it is approximately 9.5 mm from the motor edge rather than the suggested 3.5mm. This will bring the top of the gear to virtually the top of the motor shaft.
I printed these (you will require a pair) in PETG with 3 perimeters and 40 % infill. I also printed the slope \ angled element with a 1.2 mm layer height to increase the accuracy of the angle.