Replaced the two rear tires but found out the tire that fell off was missing wheel cover spacer. This explains why the tire that fell off could not be tightened when reinstalled causing wheel to lock. So, need to buy that and bushings. Took the old tires and knocked out their bushing with a screwdriver to see how to remove. Pretty easy so will order 8 two for each of four wheels. Will also buy nylock nuts. Thanks again.