[V8] UFO Brake Pad Backing Plate

[CoultL at aol.com]

The inboard (brake piston side) UFO pads that were in my car when I bought it 
had a thin backing plate glued to the actual pad backing plate....ha how 
clear is that?  I think/hope most of you will know what plate I am talking about.  
The pads I just bought do not have the plate installed.  I does not seem like 
Audi sells this part.  Are they necessary?  What is their function?  Where 
can I get them?  TIA.

-Justin Lewis