I noticed the original Y-limit switch bracket on Ender3/Pro style printers was not appropriately aligned to make contact when mounting linear rails to the extrusion. Additionally, I noticed that I lost about 10mm of print size on the y-axis.
This bracket will offset the y-limit switch and adjust it to make contact using the linear brackets I created here: https://www.printables.com/model/229221-mgn12h-y-linear-rail-heat-bed-mount-ender-3pro-cr1.
Use either the existing mount holes/screws on Creality printers or 5mm X 8mm screws with drop-in T-Nuts.
The author hasn't provided the model origin yet.