I'm not sure of the fittings' size. However, if possible, drive your car to the auto parts store and they will know the size of the brake line. Per UNGN (a board member), "be sure to use inverted female to NPT male adapters for the body of the line lock. Otherwise you will have problems". I bought the fittings at Carquest. It took a couple trips to get the right ones. Cotton sells the whole kit with brake line and fittings. Good luck!