Ok, I am remembering a little bit more about it now. The doubled up spacers (cut off axle flanges) are for the drivers side, not the passengers side. So they do make up for the added width, when the hagen widening mod is done. So if you didn't do the widening mod, you wouldn't need the doubled up spacers.
The single spacer (cut off axle flange) is for welding to the cut off passengers side stub shaft (so you can bolt the "new" drivers side CV shaft assembly to it. Again, you could make a spacer, instead of cutting up an axle shaft for the flange.
As I said before, you can use pieces of metal to make the spacers, instead of cutting up a bunch of axle shafts. Here is the link to bentparts pics that show how spacers can be used, instead of cut off axle flanges.
Passenger side stub shaft