The file 'M-LOK Snap-on Cover Plate 3D Printer Model' is (stl) file type, size is 6.3KB.
This is a very basic M-LOK Cover plate that should fit into the holes.
Flat side on preferably textured plate for a nice texture.
IMPORTANT
You may need to change the dimensions in your slicer to make it fit as snugly as possible, in my case I had to scale X to 101% and Y to 102%.
M-LOK_Cover_Plate.stl | 30.0KB |