Hey Sword,

You should have 20x8 front and 20x9 rear wheel sizes on your 2010 SS. The tire sizes should be 245/45-20 and 275/40-20. You may go 20x9/10's ($839 + shipping) with those tires or stay with the 20x8/9's ($799 + shipping) in the gloss black ZL1 replicas. If you have any questions, please pm me for a much quicker response.
Thank you for your interest.

Bruce