Skoda octavia elegance 1.8t 2002 automatic brake discs

Hello all,

I have just bought this car and love it. However I need to change the rear discs and was wondering if someone could clarify whether it it is 232 or 238mm dia. I have spoken to brake companies and they have told me both sizes. As far as I was aware my skoda took the 232mm and the 4 wheel drive version took the 239. If anyone could help it would be most appreciated

Thanks