Bushings on Front End Sway Bar Needing Replacement

What is your question?

I have been hearing a clunk in my front end when I go over a bump. The service department at my auto dealership said that the bushings on the front end sway bar are loose and need to be replacement - cost about $140 and a one hour repair job. Is this legitimate diagnosis or will it lead to other problems? This problem is not affecting the performance of my vehicle.