I have the repair manual you mentioned, but it doesn't contain any useful information about replacing the rubber-to-metal bushings.
Now I had the rear axle bearings replaced at a small workshop. It cost 80 euros, which is a fair price. Because it's a very difficult job. The brake lines had to be opened, and since the bearings were extremely tight after 190,000 km, they had to be pressed out using a suitable press.
