I originally acquired a set of Z32 30mm Aluminum 4 Piston front brakes in July 2009. The mounting points on the calipers would prove to be a major issue. So I passed on the calipers and saved the 30mm rotors. I had to bore out the rotor hat in order for it to fit snugly on the hub. From here, I went on a search for the most ideal 4 pot aluminum caliper.
I sourced some RX-7 calipers, pleased to stick with the Mazda.
They were designed for a much lighter car (almost half the weight) and as a result, not willing to work with my Z32 rotors.