MJ,
You are looking at state of the art Italian technology here!!!!! 
No cotter pins required or used or have the provision for it.....only new nuts...... Use a nail to release the nuts from the spindle....watch out for the threads......
I used cotter pins only because I drilled holes in my spindles....gonna save the world......! Did not take into account how deeply hidden the holes would be in the hub!!! Had to pre-curve or arc the pins in order to get them in and out easily.........
Order extra nuts....they are cheap....... See LeeA, he's the nut dealer! )))
Steve