The other model looked great, but it didn't fit the Mkiii. I threw it into Tinkercad and moved the hole to the correct distance and adjusted the spacing on the extra material around the screws.
Just like the original, this should be printed with the plate side down, supports for the counter sunk screw holes.
I was able to use some spare 10/22 screws to mount the plate, but I had to file the rear one down so it didn't apply pressure on the bolt.
The author remixed this model.
Hole spacing changed to fit the MKiii