Brake Master Cylinder Repair Kit

The brake master cylinder is leaking I am able to find a service repair Kit, Wemoto supply one but it is the wrong size i.e 11.9mm diameter the Vectrix is 23mm https://www.wemoto.com/parts/picture/is-brembo11-9 does anyone knowdoes anyone know whether Vectrix supply this? I have sent an email but have had no reply.