Took the car(73 stang) in for front wheel aligmnent today and instead of solving one problem another one appeared. Firstly the 'specialist' couldn't set positive caster. As he was shortening the strut bar(pulling the wheel towards the front of the car), the computer was indicating that the caster was getting more negative! After a group discussion with other mechanics , the 'specialist' said that the left lower control arm i have fitted is identical to the right lower control arm. He said each side should have a unique lower control arm . Is he correct?! I have recently fitted laurel mountain mustang front suspension kit.