Wheel spacers?

[MaxHarvard]

Ok, i know they arent that good for your car, but i've run into a problem where i've boughten a set of rims that are "suppose" to work, with all the same specs from camaros.net that others say that have used, but i'm running into rubbing issues, especially when i take corners. I figured using a 7/16th spacer would eliminate the problem... thoughts?

It isnt rubbing too much on the inner fender well, very minor, havent even rubbed off the lettering on the tire!!

Btw, its the rear tires we are talking about.