Allow installation of a 9007 Bulb or Kit onto a vehicle that uses 9004 wiring connection
Sold as a pair of 2 wires
Connector 1: 9004 connects to vehicle
Connector 2: 9007 connects to the bulb or kit your installing
So there is no confusion. This wiring is used to connect an existing 9007 bulb or HID / LED kit to a vehicle, usually older vehicle, which has the 9004 type connectors.