Sorry, those measurements are ambiguous. See this figure:
photos.app.goo.gl
Preferably to 0.1 mm. You can read 10ths on that manual caliper as well.
First, are those 3 "fins" actually tabs to screw into something or "columns" as shown on the above diagrams? I've drawn one like those diagram and one like I'm suspecting based on how Honda usually does things. Which is it? Actually, looking at pic #4 in post #3 seems to confirm my suspicion. I think I can get the bevel off that pic. (Sorry my drawing skill is so bad.)
For a, I need the height and the "nut size", d
For b and c, I need height and diameter.
e only applies if they are tabs.
Q1-Q6 should be clear from the diagram. I'm aware of the curvature of the segments, even though I didn't draw it that way but I need the straight line measured distances, not around the arc.