proper back spacing and bolt pattern for 18x10" wheels

Anyone know what the correct bolt pattern and back spacing would be for a set of 18x10" wheels that would fit a 4th Gen Z?

Thanks!

All 3rd and 4th Gen F-Bodys have a 5 lug x 4.75" (120.65mm) bolt pattern.

The correct offset for a 10" wide wheel would be in the range of 45-55mm, if you are using them in the rear only. To use them in the front, its going to be a very tight fit, and the offset would have to reflect the exact width of the bead retaining flanges to get it correct. You are probably looking at 50mm in the front, but it will be very close to the steering knuckle in the inside, and the outer edge of the tire could be pushing outside the fender a little. Anything over 9.5" in the front requires very careful measurements.