17's in the front and 18's in the rear

Hey guys I just picked up some Z06 rims. The fronts are 17 X 9.5 and the rears are 18 X10.5. I have searched but can't seem to find anymore info on the ABS . I was curious what sizes I need to go with so as to not mess up the ABS. Someone mentioned that if they aren't sized properly that the ABS will fail under a panic stop. Any info would be greatly appreciated. I read the stickies but couldn't find anything about different size rims.

Differences in front and rear tire diameters do not upset the ABS. ABS engages when it senses the wheel speed approaching "0". Its not activated by minor differences between the front and rear wheel rotational velocities.

Well I read in one of the stickies someone said that tires must be sized properly for the ABS. Also over at LS1tech someone else said that his tires screw up the ABS above 55 mph.

I can see different diameters messing up traction control and the 'calculated' style of tire pressure monitoring, but I don't know if that is really a problem.