Correct size brake discs for A3 TDI

[f13ldy]

Want to get some standard brake discs all round for my 2001 TDI TD130. Looking at the VW spares website there are a number of sizes

http://www.vwspares.co.uk/a3brakes.html

I can't find my service book so I don't know the three digit code. Any help mucho appreciated.

TIA
Carlos