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Just looking quickly, I turn up a pretty good match with Good Year Eagle F1 GS-D3. Sizes 255/45-17 (26" dia.) and 285/35-18 (25.9") or 275/40-18 (26.8") for a bit of a raked look.
I am using 4" backspacing on the front and 4.875" on the rear. My rear tires are flush with the outer lip of the fender. As long as you use 18's on the rear you can do 5.25". This will tuck them under a little better.
[QUOTE=70 LS1]I have 17x8 and 18x9.5 with 245/45/17 and 275/40/18 Kumho Ecsta MX tires. Stock trailing arms.
I also have this combo. The rear tires are about 27", so they fill up the wheel well and keep the speedo happy. This setup was also used on the C5, so you should have a good selection of tires to choose from.