Rear spring question

[Mark Coffin <coffinm@mail.ecu.edu>]

Hi all,

After disassembling one of my rear springs for restoration, 
I'm curious about the little square pads of material 
between the leafs.  They appear to have been made of cloth, 
or similar material.  Are these really necessary or is it 
OK to reassemble the springs without them?  What is their 
purpose?

If not, what kind of material should I use.  I was thinking 
of maybe thin rubber sheet?

Thanks in advance,

Mark Coffin
SRL311-04425