Fan belt - T3 MV motor 90 Amp alternator OEM original spec Part # 025 903 137 G
Discussed recently in a different thread, this belt is the best fit for the pulleys.
This 9.5mm width belt is not available from usual auto part stores here, I purchased mine years ago from the local VW dealer spare parts department. Its branded Continental, also stamped with the VW and Audi logos.
