The radial caliper is not important here. I think that if you find a 320m mm wave disc you will fit it without any problems.
yep that what i'm after now.. i just measured me discs on me track wheels and they are 310mm ..
so i just did a 3 day trackday @ portamao park algar with to small discs.. !! i wondered why the brake lever kept coming back to the bar ..!!!!
And i kept missing braking markers !!!, so the old discs are going in the bin.. as 1 is warped like a tea cup saucer !!!