Wide rubber strip across base of windscreen - W124

[Greg in Oz]

The wide rubber strip that runs across the base of the windscreen on my father's W124 '93 E320 coupe has come away from the windscreen on the passenger side (left side here in Oz). It appears that it has torn away from the section that engages in a channel to secure it. Attempts to secure the rubber to the glass with contact adhesive have been unsuccessful. It would appear that the rubber strip can be replaced as a separate item. Has anyone performed this job? How difficult is it? It would appear that the wiper needs to be removed first. Whilst the rubber strip is little more than cosmetic, I would like to try to put this right for my father.