I debated between CCW 505's but setteled on 550's with grey centers. Using Pirelli 275's in front and 305's in rear, close to what you did. No rub and they fit inside the fender well's. I did not like the lugs from CCW so I bought the lug/lock kit from
www.gmpartsdirect.com for about $90. They are larger and fit the recess of the wheels lugnut pockets much better. They are made by Mcgard. They use a 7/8 inch deep thinwall socket and have large flat face rather than a tapered, thinner face. Hope you can see them clearly enough in the pic.