I have a 2000 A6 2.7T and replaced my sport suspension sway bars with aftermarket ones.These should fit all A6 cars from 1998 to 2004: perhaps others too....

I have both front and rear antiroll/ sway bars and all bushings. They are in pretty good shape but since they are so cheap, I would recommend new ones to get the maximum beneifit from the bars.

I am looking for $150 plus shipping.