retaining shims

[Greg Chirpich <sportstergreg@everestkc.net>]

I must have screwed something up as I lost three of the four retaining 
shims on my right rear brake.  Luckily, I still have the spring shim.  
As the three I lost are flat, can I just make copies of the three flats 
shims?  ( I didn't see a vendor selling shims in a quick search.)  Any 
particular metal to use?  I haven't put a magnet to the right side 
shims yet but as light and soft as they are, I am guessing they are 
some type of aluminum.  Thanks in advance.

Greg
69 2000
Overland Park, KS