Hose line for 518+518i+520/4+520i+525+528 all years of manufacturing only LHD-models, you need 1 for 1 car and for 518 up to 11/1978 only RHD-models, you need 1 for 1 car (518 RHD 3825837 / 518A RHD 3865226) and for 520/4 all years of manufacturing only RHD-models, you need 1 for 1 car and for 520i up to 10/1975 only RHD-models, you need 1 for 1 car (520i RHD 4440326)