[V8] Source for rear glass

[Mark Kalbskopf]

On Saturday, the top half of a tree by the side of my driveway,  
snapped off in the high wind.
Unfortunately it was a very tall oak tree.  After leaving a couple of  
holes in the roof of the house, it smashed down into the driveway and  
destroyed the Audi's rear window, and bent the C pillar badly.
I've pushed out the C pillar, but does anyone know where to source the  
rear window?
Several glass companies are giving me the "sorry, can't find that one"  
line.

Mark.