Sorry, didn't have a lot of time before going to work yesterday and got the wrong manual. :o
I have now found the correct manual on Vintage Machinery.
http://vintagemachinery.org/pubs/338/2705.pdf
This manual is for the 10er shaper fence with the metal fences. The fence I have has the wooden fences but looks pretty similar. Unfortunately it doesn't have the spacers installed and I can't see any in the "box of goodies" that came with it. So, I'm afraid I can't be of help on this one. :(