I couldn't find a replacement for a broken Y-axis motor for my Ender 3 S1 and it turns out Ender 3 V2 motor is the same model but has a shaft that's 6mm longer. This spacer allowed me to mount the Y motor from Ender 3v2 on my printer so I can wait for warranty replacement with a printer that is working. I used three M3x12 screws to mount it.
Height can be easily adjusted with a slicer so 6mm is just a design choice for my needs.
The author hasn't provided the model origin yet.