Convoy S2+ O-Ring size

Does anybody know the size of the tailcap o-ring for a convoy s2+? Thanks.

22x1.5? Same to A6 if Im not mistaken.

these should do :smiley:

The ones listed in Simon’s store are 21x1.5mm with a choice of black, red or gitd.

For 20mm x 1.5mm Viton O-Rings, I found this at Amazon: