Robert,
You may want to try something I did a few years back. I removed the Right wiper and arm and only use the left (here in USA). It only leaves about 3 inches on the right side unwiped that would have been wiped if it had both.
The wipers are quieter and cost 1/2 as much to replace the blade(s).
Also I have found blades at Car Quest at a much lower price. And they work good.

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84 500 SEL (307,xxx miles)