Apple Watch bands designed for 49mm are compatible with all 44mm, 45mm, and 46mm Apple Watch models. The reason for this is that the three sizes (44, 45, and 46mm) have very similar widths on the band, so a band that fits the 49mm model will also fit the 44, 45, and 46mm, as they are almost identical in dimensions.

Below are the models that have 44mm, 45mm, 46mm, and 49mm:

• Apple Watch Series 4 – 44mm
• Apple Watch Series 5 – 44mm
• Apple Watch Series 6 – 44mm
• Apple Watch Series 7 – 45mm
• Apple Watch Series 8 – 45mm
• Apple Watch SE (1:a generation) – 44mm
• Apple Watch SE (2:a generation) – 44mm
• Apple Watch Ultra – 49mm