[mohrds]

Does the clattering go away when you lightly apply the brakes? If so, you simply need to add back the OEM shims that were probably pitched during a past brake job.

If the clattering remains during braking, it is something else. Statistics would say it was the strut mounts, but that's not an absolute cause.

Have you attempted to tighten the big strut nuts under the hood? Pop off the black plastic covers and tighten the center nut. Some people have noted that their's were so loose you could turn them by hand.

Doug