Upgrading to 15' wheel vintiques series 63

Just as soon as you take the wheels from the box , lay a straight edge across the back of each wheel and check the backspace. A few years ago I bought 2 wheels from Jegs and from Summit , both pair were not as I ordered , they were anywhere from 1/8 to 1/4 more backspace and each pair where not the same backspace.
So just a warning , they people making these wheels are not rocket scientists , so beware !!!

Frank