actually i checked the rears again...with a measuring device other then my eyes....backs are 323 X 1"(bout 25.4mm)
I measured fronts when we just put new rotors on, and i eyed them off with the backs and they looked similiar, well 20mm smaller in diameter they actually are.
Recap Fronts= 343mm X 32mm
Backs= 323mm X 25.4mm
Alcon monoblock 4pistons front and rear.
Run SBS Dual carbons up front and Carbon Ceramics on the arse.
My apologies for the fark around with the half arsed info.