Each mainboard flex here fits one generation and one case size of Watch Series: 40 or 44 mm for Series 4, 5, 6 and SE, and 41 or 45 mm for Series 7, 8 and 9. The case size is engraved on the back of the watch, and 44 and 45 mm are easy to confuse because they look almost identical. Choose the generation as carefully as the size, since every series from 4 to 9 and SE has its own cable.
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Each mainboard flex here fits one generation and one case size of Watch Series: 40 or 44 mm for Series 4, 5, 6 and SE, and 41 or 45 mm for Series 7, 8 and 9. The case size is engraved on the back of the watch, and 44 and 45 mm are easy to confuse because they look almost identical. Choose the generation as carefully as the size, since every series from 4 to 9 and SE has its own cable.