Clio 197 F1 Mtec Brake disc bore size?

Hello everybody, i am new to the forum.
I own a clio 197 F1 edition in liquid Yellow, and i love it!!

I am at the moment replacing a lot of parts on the car hoping to get the car driving mint again.
therefore i have ordered mtec brake discs for the front and rear however mtec have sent me an email requesting the bore size of the rear brake discs. Giving me 2 optina either 25mm or 30mm

I was wondering if anyone could help me in how i could work this out? Or would i have to actually measure the brakes?

thank you
 
I think they have got confused with the Megane rears, which can be either 25m or 30mm (R26). All mk3 RS Clios are 30mm though.

Also Clio rears should be 10mm thick, vs the Meg R26 which is 11mm. However 11mm fit fine.