I have a good used one from my 4000 if you need/want it. It's collecting dust after going to the one-piece gasket. Open to offers.
I think I sourced my one piece gasket through Audi Tradition (pretty sure Wiley helped me out in getting it). I need to get the one piece rear now, but haven't seen them for a while and wasn't too keen on the $150 price tag at the time!