Hi, Been down this road after I took my AP kit off my E46 M3 prior to selling. I spoke to AP asking if the M3 kit would bolt on to an E86 Z4MC OK. The rears are no problem, but I was told that the fronts need different bells and brackets, same rotors and callipers. I have not tried the AP kit on yet to see the difference, or where there might be fouling with the M3 hardware. Hope this helps.
Cheers