Bob - Which Company and year is the Service Manual? The '68 Plymouth only shows 3 possibilities, one for each type of carrier, each side is 5 pieces.
Side Gear:
Flat Plate
smaller flat disk
Dished Plate (beville)
smaller flat disk
Flat Plate, thin

edit: illustration in tech archives
http://www.moparts.org/Tech/Archive/axle/13.html
and some rebuilding tips in this thread.

I think there was an article in one of the magazines way back about what it takes to make them tighter..