McMaster-Carr is also my normal go-to for quality O-rings. I checked there, but they don't go as small as the 1 mm ID/2 mm OD that others called out.?
They do,?at least on the ID side. The smallest size on those McMaster-Carr o-rings is about .075mm ID, and the next one up is 1mm ID. ODs start a little larger?than 2mm. This is round rubber, it may not be extremely important for the OD to be exact to fractions of a mm.?
