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Leave it to Preis to find something wrong with your car. I hear a missing wiper arm rubber is indicative of a re-welded front clip. I'm sure you're okay, though.
I've got one you can have. Fell off the car about 4 yrs ago & I never figured out how to put it back on. Personally I don't think it really does anything
PM me your address & I can get it in the mail tomorrow.
It does do something. It keeps the wiper blades and arms separated so they do
not "vibrate" against each other.