Back spacing for CTS-V calipers help please

[JoshuaGrooms83]

Alright im trying to get some clarification here.
If i were to get 19x10 C6 ZO6 rims with a 65mm offset and a 70.3mm hub, would that clear?
Im not really understanding the offset thing for them to fit.
The CTS-V thread said if they have a 56 they wont but if they have a 42mm they will? im confused on which way is good or bad. im just trying to get a rim that i can later down the line stuff some CTSv calipers and rotors in there.
Its between these two rims that i want to get

[xmarkx]

I wouldn't worry too much about it, when you put the ctsv brakes on you can always get a spacer kit with lengthend studs if you need some clearance

[JoshuaGrooms83]

I know, but i want to try and not put on spacers and pound out studs.