The Reenmachine lighting system is a plug-and-play setup that can be completed in about an hour. It fits all '65-'73 Mustangs (except '69s-see the sidebar). The included wiring harness is plugged into the car's existing headlight harness via one of the old headlight plugs. From there, the harness is routed, connected to power and ground, and the headlights are installed. The various legs are extra long to accommodate mounting locations and routing. If there's excessive leftover harness length, slack can be cut and the wires can be securely respliced together-be careful to match the colors-or it can be coiled up, tie-wrapped together, and tucked out of sight. There's plenty of room in the cavity behind the headlight buckets to hide the wires. Reenmachine preinstalls the H4 halogen bulbs in the Hella headlight housings.