R-57 14 Mini Convertible - Clunk when going over curbs
 

I had a bad clunk when going over a driveway entrance or curb, anytime that the car was twisted axially.

I was certain it was coming from the rear, thought sway bar link or sway bar bushing.

Ordered parts - links and bushings.

Tore it apart - all looked good, replaced bushings, reused links.

Still clunked.

Crawled around underneath and tightened everything I could see connected to the suspension.
I found a loose bolt holding a long metal bar which runs from the center of the rear suspension assy to the left side under the driver's door.
The bolt under the drivers door was about 1/2 turn loose.
Tightened it and clunk is gone.

Good find! I would've also thought your LCA's might have been a bit worn. Glad you found your issue!