Yesterday I got a set of wheels off of an 05 Impala at a local junk yard. They are similar to the ones that came on the 98 MC Z34 wheels, but the spokes are a little thinner. And the offset is not the same. The wheels do not clear the calipers on the front and the the rear tires are very close to the wheel wells in the back. How thick of a spacer would I need to get a safe clearance on both the front and the back? Both sets of wheels are 16x6.5 and I'll be running 225/60/16 tires on the car. Also, would I have to shave the stock studs or replace them with shorter ones if the spacer is not thick enough to completely cover them?