[Zeke]

Your bar has most likely slid to one side. Tap it back to center and install some hose clamps on the inside of each bushing to keep it centered.

The hose clamps look terrible, IMO, but they work. If you can find something a little more sanitary like the engine chain tensioner collars with a 22mm hole, they would look better and do a better job. The hose clamps may dig into your bushings, but your bar will stay centered and you won't hear the clunk. It's a good fix, even if only temporary.