Attached are the M/L and S/M bands. The Nike knockoff is a different brand (that I didn't like as well) but the sizing should be identical. The two sport knockoffs are the CRESTED ones I listed before and I find them to be very good. So good I just ordered more earlier today and other styles outside of Sport.
(I should have probably lined up an Apple Sport band but I didn't. They seem to fit the same to me though besides the material being slightly different on Apple's.)
My wife wears the S/M on her 42MM Series 3. I wear the M/L on my 42MM Series 2 SS. I personally don't like it when I wear the band and it is on one of the last holes. This is personal preference and some may like it that way though.
Hope this helps.
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How were you able to order the modern buckle? I only see an option for bulk buy (50 piece min).