If you ever need Stock Offsets or OEM Offsets here they are for the CTS family. Don't see one let me know, I will dig it up for you and get it posted. (They are the ones labeled Stock Offsets in lower left corner.)

Coupes:
http://www.customwheeloffset.com/whe...e=&suspension=

Sedans:
http://www.customwheeloffset.com/whe...e=&suspension=