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Bob, what offsets and wheels are you using with your 18x9.5 wheels? I would think that 18x10 or 18x10.5 (front and rear) would be very good choices.
Silverton, you will probably find my answer hard to believe: I used C-5 rear wheels all around. High polish thin spokes. I had four brand new that I did not use for another project. Stock C-5 sizes. 18x9.5. I tried the wheels on the car and they were perfect. I have pictures that I can E-mail to you. The fitment is absolutely perfect. I used a Z06/Viper size on the front. 275x35x18. Michelin Pilot Sport ZP
The rear is 275x40x18 Michelin Pilot Sport AS ZP.
C-5 offset rear wheel is +65mm
C-6 stock front is 58mm
rear is 79mm
This is not a track car. This combination sticks and handles more than enough for me for sprited back country driving. I used these wheels because I did not like the comp gray wheels that came on the car. Let me know if you would like me to E-mail pictures. It will at least show you how the offset and tire sizes look on the car to help you pick wheels that you want.