Help Me!!question on z06 wheels

I have an 84 z28 camaro.I was looking into buying black and chrome Corvette z06 wheels for it 18x9.5.The only problem is no one know what size wheel spacer i would need to make them fit.If anyone knows can you please get back to me it would help me out a bunch.THANKS

2" front and rear

Please post a question only once, and on the correct forum. Your post on "General F-Body Tech...." was moved to "Wheels and Tires".