If you own an original Audi S4 or S6 model (1992-1997) you might like to know that Audi here in the U.S. has a special on the fuel tanks remaining in their stock. These normally run a whopping $903 but can be had at big discounts right now. I just ordered one for $173.67 out the door with tax here in MN.
If you live in rust prone areas don’t be surprised if you see your tank start leaking around the seams at some point. Granted, your fuel lines under the car will start leaking first more than likely but your tank won’t be too far behind.
The part number for the tank is 4A0 201 075L