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Message: <blockquote data-quote="krs" data-source="post: 1852207" data-attributes="member: 67742">Like Patrick and Ian, I can’t help either, but I’m not sure I understand what you are looking for.The IAN210 series you reference are 6 and 10 terminal devices, but then the reference R5750 is a 4-terminal device.So are you looking for the part number for the R5750 on that board you are referencing?Where does the screen shot come from that you included in your post - would that document not show the part number for R5750?As to the crystals, there is a possibility that those are not commercial items but a “special” for Apple.I worked in a High Tech company and if the design calls for say a crystal with a better tolerance than the standard one, the manufacturer would sort them for us an apply a special product code - for an additional fee of course.Something to keep in mind as a possibility.</blockquote>