D4 S8 Disc brake size

[A8 Ian]

Need new discs and pads.

But every supplier is saying they are 356mm.... if they are 380mm on the 4.2 tdi and the S8 visually look larger than the 4.2 tdi then what size are they ....390+mm?

I also need a full technical spec and can't find one..

I'm looking for the offset, thickness, diameter, etc. Etc.

I've found a company in America that will make oem replacement rotors in a two piece full floating. The calipers are great but the rotor let's it down when your braking from 200mph!!!

Anyone able to help me with a spec?

Many thanks
Ian