Like thstone and Geof3 said, it's like peeling an onion and a crap shoot. There's a bunch of suspension pieces and convertible pieces that are notorious for rattling. These are 12-20 year old cars. They're going to rattle on rough roads. If your mechanic didn't find any obvious suspension problems, then you're probably safe to drive it. I suggest having a friend drive your car on a rough road while you try to narrow down where the noise is coming from.
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Woody
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