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While i cant say for sure because i would have to look at it, i can say that the most common thing that causes this is the rear stabilizer bar mounting bolts or bushings are what usually causes this noise with side to side movement while sitting and when going over bumps. Below is a diagram and i circled the areas that need to be checked for bolt tightness and bushing wear. Look them over real good and make sure ALL mounting bolts are tight.
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Let me know if that diagram came thru please.