We are about to embark on our first long road trip in our ID4. In preparing for the trip, we thought it would be helpful to familiarize ourselves with what to do in case we have a flat tire. So we have looked at the instructions and gotten out the contents of the breakdown kit. But two of the things it mentions are a Spare valve core and a Valve core extractor. we can't locate either of these things in the kit. can anyone give us a sense of where they might be, or whether they are actually necessary to make the repair?