Which traction bars to keep?

matthon said
On a set that includes the shock plates, what would be the reason to extend the traction bar beyond the shock plates?

My car had these traction bars on it when I got it.
I took them off as the large square shock plates need to be trimmed to fit the larger tires I put on.
I will be putting them back on, and painting the 'correct' color, knowing they have no function, in my case, other than returning to full Day 2 stat.

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I am only guessing. Maybe for hard braking? I saw a video of an old road test . Can't remember what car. They were measuring stopping distance. Hard stops made the rear section of the spring flutter quite a bit.