Brake modulator actuator O rings

We need to purchase o rings for the actuator on my CD Honda Accord but Honda don't make them anymore and apparently that means we need to pull it apart and take the O rings into a supplier for them to make a match. Don't know how we are supposed to drive our car 80km to the supplier with the brakes pulled apart though…. Can anyone please tell me the size of the O rings so we can purchase them while still having a car to drive?