It calls for a 23" but many of the replacement wipers that are supposedly for the 300E use a 24" wiper. While I was changing out blower motor my wiper arm fell and broke the retainer so I have to replace the wiper blade.

If I use a 24" will that work? So far I have only found one wiper that will work on the arm, which was the Icon by Bosch, but I let the sales guy sell me a 22" because they didn't have 23" in that model and he said 24" wouldn't work. But upon further research I noticed that many of the Bosch replacements for my exact model/year use a 24".

bottom line, does it really matter 23 or 24"? I do have the articulating system, of course.

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1999 Mercedes ML320
2002 Mercedes 230K