I am rebuilding a 1967 tilt steering column. The turn signal switch is missing. I have a 1968 parts column and the signal switch connector is the long flat one. The connector that is on the column right now in the 1968 car is the curved one. I don't know if the column in the car is original. I don't have the entire car harness available right now so I don't know what type connector is on it. When I look up new signal switches, some are flat, some are curved, and some come with an adapter to make either work. Which is the right one for a 1968 convertible?