What is upper Link Bushing ? on 2004 Audi A8 Quattro

It Makes a Noise when turning sharp, sometimes when I stop to back into a parking space, but otherwise I have no problems.

Asked by for the 2004 Audi A8 Quattro
The Audi has two links that would on other cars be an upper wishbone. They do fail and make noise or show signs of play when they are failing.