Galaxy Watch 8 and Watch 8 Classic (40mm, 44mm, 46mm)
Uses Samsung’s new Dynamic Lug connector. Not compatible with standard 20mm/22mm quick-release bands. Please order band specifically made for Galaxy 8 (we have plenty in our collection).

You can use a 20mm width band with:

Galaxy Watch 7 (44mm & 40mm)
Galaxy Watch 6 (44mm & 40mm)
Galaxy Watch 6 Classic (47mm & 43mm)
Galaxy Watch 5 Pro (45mm)
Galaxy Watch 5 (44mm & 40mm)
Galaxy Watch 4 Classic (42mm & 46mm)
Galaxy Watch 4 (40mm & 44mm)
Galaxy Watch 3 (41mm)
Galaxy Watch Active 2 (40mm & 44mm)
Galaxy Watch Active (40mm)
Galaxy Watch (42mm)

You can use a 22mm width band with:

Galaxy Watch 3 (45mm)
Galaxy Watch (46mm)
Gear S3 Frontier
Gear S3 Class