Both sides have 4 indents. The first 2 photos are without the diagonal and the second have the diagonal on the corner.
The indents are 20.5 mm apart
The width of the thick leg is 5.2 mm
The width of the thinner leg is 3.9 mm
If that makes sense that is .....
There?s one more width, both legs are 5.45 mm wide or thick depending on how you define it