I just replaced both my rear bearings on my 1989 300TE.
I just removed the rear hub, took it to a shop, where they pressed out the hub, removed the snap ring and then pressed out the bearing. It took like 20 minutes for each hub and I paid $40/-.
I would not buy a new hub unless the 201 chassis is dramatically different than 124 chassis. I also replaced the joint/bushing in the hub.