Thanks for the info! I contacted the Firestone that replaced the tires and asked him about it. He pulled up the invoice and said that the bolt was already cracked and when they removed the tire it broke. But he then said that the guy I bought the car from went to the dealership and purchased a new one for them to put on. Why on earth he only told me that they had broken the bolt is beyond me. At any rate I took the car to my mechanic today just to make sure everything is okay in that regard and to see why the car shakes at around 65 mph. Someone else here was kind enough to say that it's probably needing centic rings so I'll mention that to my mechanic when I hear from him. I'm off to check to see what those are! Love this forum and thanks again.