I bought an LX dual stacking arm secondhand that was supposed to include all the hardware, but is actually missing some parts. The only serious omission is the plate and bolt that are required to mount the arm through a hole in the desk (as opposed to clamping it to an edge). According to customer service, that's called the grommet mount kit and its kit number is 697-366-00. (They're the first two parts in the photo below.) Unfortunately, Erogtron does not sell those parts separately. Does anyone know how I can acquire them? I live in Toronto, Canada.