My neighbor with a TTZ has this setup , the bracket does NOT fit , we tried it on my car already..
Plus Z1 is a ripped off ,if you read the things theyve done on TT.net and other Z fourms you be shocked.
I had it out with Adam and few others speed shops down here had issue with him.
you can pick up Cobra rotors from Advance auto , you will need to shave a bit off the caliper so that you can run the 13 inch rotor and use the FULL FACE of the brake pad.
Right now your current using 80% of it correct ? when you replace the pads usually you see the top edge still there. Thus why you need to grind the caliper 1mm down. But thats with the 13inch rotors.
Do not grind it if your using the 12.6 rotors or else you might get some viberation'
EDIT : You can sort of see the 13 inch rotors.
Same Blitz Wheels at the one on Z1 site, Its been powdercoated.