These harnesses will convert any US-spec headlight (5-pin connector) to a EU-spec harness (6-pin connector) making for an easy upgrade to a set of Morimoto C7-Style LED headlights or GTR Carbide C8-Style LED headlights on your EU-spec car. Historically when buying new headlights for a EU-spec car, it usually requires wiring modification but these harnesses will alleviate that need and make it a true plug & play installation.