Each of these mainboard flex cables is cut for one Watch generation and one case size, from Series 4 through Series 9 and the SE. Earlier models use 40 and 44 mm cases, while Series 7 and later switched to 41 and 45 mm, so the size marked on the back of the watch is as important as the series number. A cable for the other size of the same series will not fit.
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Frequently asked questions
How do I know which strap width fits my watch?
Does a smartwatch need its own SIM card?
What does a watch's water resistance actually mean?
Each of these mainboard flex cables is cut for one Watch generation and one case size, from Series 4 through Series 9 and the SE. Earlier models use 40 and 44 mm cases, while Series 7 and later switched to 41 and 45 mm, so the size marked on the back of the watch is as important as the series number. A cable for the other size of the same series will not fit.