Not sure if this is of any use, but I have an A6 Avant Quattro with a 2.5TDI AKE engine, that runs perfectly. I'm selling the entire car for £1000. It has a dead auto gearbox.
Interior is cream leather, black dash and trim, front heated and electric seats, xenon lights, Dolphin grey in colour. A lovely car, just cannot find a replacement gearbox.
I have a Manual 2.5TDI C5 Allroad too, and an A4 B6 1.9TDI Avant Quattro. Love this era of Audi.
Let me know if this interests you Steve