Thats what I was talking about. All the calipers are identical. The only difference between the ones used for the 340mm discs and the ones used for the 370mm discs is the mounting points are a little further from the caliper on the 370 ones to accommodate the larger discs. The 'M' cars use exactly the same calipers as well. But if you wanted them in red, orange or gold that was called the 'M' performance option and was an option that cost considerably more than just having them blue. Yes you got slightly different discs (dimpled and slotted) along with the larger 370mm ones if you wanted, but the only difference in the calipers was the colour. Quite a nice little money spinner from bmw!