what size front discs for my A4 3.0 cab?

[A4B6Cab]

As above, entered my reg for my 2003 A4 3.0 cab on ECP website and it shows 2 size front discs, both vented but sizes of 288mm dia and also 320mm dia??

Is this right??

[Guest 2]

Check the PR codes in your data sticker in the spare wheel well or under the rear seat. Type them into http://igorweb.org/equidec/ and see which 2 codes relate to your discs, use these codes to cross reference the discs given on ECP and see which ones match.

[Lukenkarl]

Or you could get a tape measure out