The braided solo loops are only in 42mm or 46mm, but the 42mm is OK in that style.Presumably we can still buy these in the 40mm SE size as well? I plan on getting a 40mm Lake Green Sport band.
I also think the new SE will go from 40mm to 41mm, so we should be fine.
My mother just received her 40mm Lake Green sport loop and it fits her 41mm watch perfectly!