These harnesses are available as either Classic or Classic-Plus giving the expandability and flexibility you may need to be creative with your project. The major difference between these are the “Classic-Plus” kits include provisions for you to add extra accessories you may want. Examples of these additional accessories might be: power windows, power door locks, a power antenna or maybe a 12 volt accessory port in your trunk to charge your cell phone. Customizable Kits range from “very adaptable” to any vehicle or are available as more vehicle specific options. However, the more vehicle specific options still allow you the expandability to wire your vehicle how you want to for more accessories.