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Tie bar clearance
No
I'm not exactly sure what is meant by a bar. There are metal pipes sunk in cement used to tie your horse. That is called a tie bar.
It is also referred to as a 'hitching post' and can be wood, metal, or plastic depending upon where and when you find it.
Check tie rods, ball joints, trac bar, and u-joints.Check tie rods, ball joints, trac bar, and u-joints.
You named them in your question.