I just bought new rims and tires from ebay to put on my 2000 GT. I went to my local Firestone place to get an alignment. The alignment was fine and the tires are properly balanced, but he told me that the after market rim (Ruff Racing wheels 17x7) are not sitting properly on the hub and that a special "ring" was needed in order for the rim to seat completely on the hub. He said that without the "ring" the lug nuts could start backing off the hub and could damage the spindle. I have a very slight vibration at 70MPH, but nothing major. Is this true or will I be OK. I looked on the back of the 15" OEM wheel, but didn't see any "ring". Any information would be greatly appreciated.