For a 9.5" width wheel what would be the ideal offset and backspacing to put it right inline with the fender edge on both front and back of a 95 Z?

I'm choosing between TT2's and Z06's for my Z and I don't want the new wheels to hide inside the fender like the standard wheels do and I don't want to have anything rubbing

 

The TT II's with the 45mm offset are going to sit much closer to the outside of the fender line. In the front, they will probably be within 1/4". See front wheels in this picture:

http://www.kellydrown.com/showcase/120-2036_crw_std.jpg

In the back, they will probably be about 1/2" inside the fender line when viewed straight down from above the fender. The 17x11 50mm offset wheel will be exactly under the edge of the fender, by comparison.

The Z06 wheels 17x9.5 54mm offset will sit another 1/3" deeper in the wheel well.

LG Motorsports used to sell a 17x9.5 with a 38mm offset. Those were really flush with the outside of the fenders, maybe a little outside in the front.