Question for C5 owners with C6 Z06/BBK

[ragtopws6]

I have IForged 19/20 set up for the street but what do you guys run for the track? I have seen other C6 Z06 owners running rear C5 Z06 (18X10.5 wheels) to clear the calipers. I would like to know if the spacers are needed to run rear Z06 wheels. Also, would a stock C6 Z06 front wheel fit on my C5 without sticking out too far? I know they would fit AND clear the calipers but don't know the offset. I can mix the front and rear wheels as long as the front would clear my calipers. TIA!