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Good question there. I have literally dozens of old broken servos, many Futabas etc. I found that most any Futaba O-ring does the trick, and wont bind the upper shaft BB. I don't have the size off hand. But is like 1/2 the profile of what is there. A very fine small o-ring. It's just meant to seal out moisture ingress from entering at the output shaft.Soooo What size o ring is the bearing ?
A too large/fat o-ring presses into the BB race/ cage when assembled and literally locks up the BB. BB becomes useless in function. I usually remove the O-ring altogether. I don't run my rigs in the wet anyway. But I do use much grease on the splined output shaft during reassembly. Even packing this upper BB with a bit of grease, for some moral support. I usually place the o-ring over the splined shaft on the outside before mounting the Sevo Arm/horn. For sealing purposes. But with use and wear it may split and fall off. Not critical however.
My Savox 1210sg same issue. ( garbage for the price IMHO anyway)