I got the wheel vibration at 60mph, my tire guy told me i needed centering rings. I called the manufacturer, they told me they dont have them and that i needed to go to a rim shop to get them. So i went to a rim shop - the guy there looked at my rims (didnt take them off the vehicle) looked at some manual and gave me 4 rings. My tire guy installed them and said they fitted ok. I noticed that they fit my hub but, wasnt sure if they fit the centerbore of the wheel. My question is - i have heard that these rings range in various sizes, should i be concerned with what happened? or should i rely on how the guy "estimated" the correct centering rings. I did notice that the vibration was significantly reduced - but, i still get a tiny tiny amount through the steering wheel above 65mph.