Prob m4 hex cap
Even when the wheels are new the threads for the screws don't thread in very nicely, it almost feels like you are cutting new threads into the rim. You may have to use whatever screw is the closest you can find unless mazda sells them. I will see if I have a spare but don't hold your breath.
for curiousity sake.. how different are the es/p5 brakes to the msp? i know the rotors are bigger but would the p5 calipers work on the msp rotors if i sniped the rotor brackets off the msp? i need new brakes on the p5 but budget is tight for the next month. I could obviously just pull the entire caliper/rotor assembly over to the p5, but then i have to bleed stuff heh. guess it wouldn't be terrible to learn how to do it.
My racing harts are on the wife's SUV and one of the center caps is missing one of the two screws. Anyone know what the size and pitch is? I went to a hardware store and Home Depot without any luck.

