Are you sure your not better of reconditioning your original gearbox, this way you know it will last a few more years, could the one from the S6 have been deprived from ATF changes and not have much life left in it? This will then in the long run cost you more! Sorry I couldn't be much help with fitment, someone with Etka will be along shortly i'm sure to advise on fitment. I would however source it from A8 Parts myself as you have some comeback if it doesn't fit which I doubt. Also if you do buy the S6 gearbox, try and get some sort of warranty on it, a coupla months or so.
Hope you get it sorted asap mate. 
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2009 Audi RS 6 Saloon V10 - 420mm Ceramics, Keyless, Soft Close, Adaptive Cruise, Glass Sunroof, Blinds, Twin Pane & UV, Freeview & DAB, High Beam Assist, MTM bits, Audi Exclusive Bits, MRC, Milltek, GYEF1 ASY2's, Bluetooth streaming music to AMI mod - 753 PS/1021 NM
2016 Audi S3 Saloon, Sepang, S-Tronic - B&O, Tech Pack etc... Company Car
1995 Audi A8 4.2 V8 quattro Sport - Bose, Solar, Blinds
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