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Looks like a tough unit. That oughta' tighten up the rear. Take some pics as you install it, write up an article, and submit it to me. We will see that it gets published on the MF.
The function of the Watts link is to keep the rear end from moving side to side. The car will track/ handle better. The watts link is like a panhard rod except it is alot more adjustable. A sway bar is for body roll and has no relation to the rear end alignment/ movement.