The good news keeps rolling in - I found these for our stock calipers as well - they are two peice forged aluminum alloy hats, just like the ones you linked Nismoz, but these seem a little more aggressive
370Z (Sport) - RacingBrake.com
19 lbs compared to 30 lbs.
If my rims weighed 30 lbs I sure as hell would be happy with buying lighter 19lb wheels.
edit - apparently they are the same company as the picture posted in Nismoz link - but the rotor looks different in the link I posted. Hm.