I can't speak for their inability to divide by 25.4. But parts departments typically keep commonly-used parts in stock, and have to order other parts from a warehouse. Since most people replace the rubber insert rather than the entire arm, the rubber insert is much more commonly replaced. I would expect any dealer to have the inserts in stock (even more so since the inserts are shared by multiple car models, while the arms usually are not). I wouldn't expect them to have the arms in stock, but they can probably get them shipped from the warehouse within a day or two.I can convert millimeters to inches, I'm curious why the acura dealer couldn't and did not have the OEM arms
Incidentally, the stock wiper insert is 550 mm on both sides. (EDIT: Length fixed.)
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