I had a look in the parts catalogue, for 95 it says that both the 8V and 16V GTI uses the 280 mm discs, while the VR6 had the 288 mm discs. For the 96 model year, the parts catalogue doesnt break the disc size down to engine versions.

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If you have a 5 cylinder, you don't need a stereo.

1999 Audi A6 quattro
1990 Volkswagen Golf CL Syncro
1987 Audi Coupe quattro