Yup 32mm. No, the orientation was just for the photo, it can be placed at any angle of course.That's a big hole you drilled there mister ?
is that the direction you expect the cable to come from ? sort of above and pointing downwards ?
I am not quite sure "where" along the axle tube to place these tabs. Right on the lip and then dremel-stone out any buckling of the tube wall, or, further back and behind where the bearing will sit within the tube.