All late model Chevy rear drive vehicles have the same lug pattern...thank god! ;>)
G & T have given you the correct measurements, but all you need to say is Chevy Camaro.
I'll give you an example.....When I replaced the wheels on my '79 Z-28, I took one of the original wheels and put it on my '91Caprice LTZ, just to see what it would look like. Then I put them on my friends '75 Nova....the patterns are all the same. Once in a while, they make things easy.....
Have fun with your new wheels!!!