Set of 4 nozzles originaly made for the mercedes turbo-diesel engine. They fit on 1974 to 1996 Volkswagen TD. When installed on US/Canadian cars, they restore the original power level and give better fuel efficiency. They also fit on the Canadian 1993-1996 AAZ 1.9TD engine. The Mercedes nozzles will out flow the original VW GTD nozzles and still give better fuel efficiency than your original VW nozzles.