Mainboard flex cables for Watch Series 4 through Series 9 and the SE, each specific to one generation and case size. From Series 7 onwards the sizes change to 41 and 45 mm, so a cable for a 44 mm Series 6 will not fit a 45 mm Series 7. Check the series and millimetre size on the back of the case, and handle the new cable carefully, as thin flex connectors tear easily.
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Mainboard flex cables for Watch Series 4 through Series 9 and the SE, each specific to one generation and case size. From Series 7 onwards the sizes change to 41 and 45 mm, so a cable for a 44 mm Series 6 will not fit a 45 mm Series 7. Check the series and millimetre size on the back of the case, and handle the new cable carefully, as thin flex connectors tear easily.