I bought my 72 Skylark 20 years ago, when I went through the front suspension then I replaced the bushings with Moog ruber bushings. When i took the suspension apart one of the bushings was missing on the driver side upper control arm. I have torn into the front suspension this spring to check things out and have found that the same thing had happened again. One of the bushings on the driver side was GONE. What would cause this to happen again? Mike