There are 6 possible depths for these sidebar pins, but that includes the fact that there are 3 rotational positions for the pins. Left, Center, and Right. Fore, center, and aft respectively. These 6 depths are actually only 2 depths for each pin angle. So a low or high cut is the extent of the vertical range, and for the left and right pins it is the same hieght. For center pins both are slightly higher. So there are 4 possible hieghts.
Underside of the plug with the correct key inserted:
Sidebar removed to show a misalignment of unset pins:
Aligned with the proper key inserted: