If you have a PR code in the service book 1KE then it's definitely 269mm rears and if it's 1KW then should be 280mm 
I suspect it's related to front brake setup as there's no VIN series associated with the choice
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
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