Let's just make sure we are talking about the solenoid that is attached to the starter called the starter solenoid, or are we talking about the starter switch which is not attached to the starter? If it is the solenoid attached to the starter, then that comes with a rebuilt starter, and they are inseperable unless you are real brave to make that move. You would be silly to try to replace the solenoid that is attached to the starter without replacing the entire starter.