Audi in the UK were happy to order parts from Germany for LHD cars.
FTF is from a A6 2.5 TDI, although I think A4 TDI used the same box (or similar). I'm not sure if any diesels made it over to the States, I was under the impression they were not popular there.
Your best bet I think is to talk to Tozo or go over and see him, you have the expert over there who has done two of these already. Maybe your cheapest option will be a S4 box, I think Tozo used those in both of his conversions. He may even have advice about the clutch master cylinder, from the pictures I dont think he used a stock one.
If you want I can go to my local Audi dealer and find the prices for all the bits, clutch master cylinder, slave cylinder, over-centre spring, hydraulic hoses etc.
But Tozo may have cheaper solutions than brand new parts.
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