Pipe M10/M10 for 518+520/4+520i+525+528+528i+M535i only LHD-models and for 518i only for country version S and for 520/6+525+528 only automatic gear box only LHD-models and for 520/6 only manual gear box only LHD-models, from 01/1976 up, you need 1 for 1 car, circle 1 (518 LHD 4632862 / 520/4 LHD 4717633 / 520A/4 LHD 4413736 / 520i LHD 4413724 / 525 LHD 4829527 / 525A LHD 4516730 / 528 LHD 4757156 / 528A LHD 4551961)
Pipe M10/M10-283MM for 518+518i+520/4+520i from 01/1976 up only LHD-models and for 520/6+525+528 from 01/1976 up only manual gear box only LHD-models (518 LHD 4632862 / 520/4 LHD 4717633 / 520A/4 LHD 4413736 / 520i LHD 4413724 / 525 LHD 4829527 / 525A LHD 4516730 / 528 LHD 4757156 / 528A LHD 4551961) and for 525+528 all years of manufacturing only automatic gear box only LHD-models, you need 1 for 1 car, circle 1
Pipe M10/M10-310MM for 525+528 up to 10/1977 only automatic gear box only LHD-models (525A LHD 4524784 / 528A LHD 47782293) and for 528i+M535i from 01/1976 up only LHD-models, you need 1 for 1 car, circle 1
Pipe M10/M10-380MM for 525+528 up to 10/1977only automatic gear box only LHD-models (525A LHD 4524784 / 528A LHD 4778293) and for 528i+M535i from 01/1976 up only LHD-models, you need 1 for 1 car, circle 1
Pipe M107M10-310MM for 518+518i+520/4+520i from 01/1976 up only LHD-models and for 520/6+525+528 from 01/1976 up only manual gear box only LHD-models (518 LHD 4632862 / 520/4 LHD 4717633 / 520A/4 LHD 4413736 / 520i LHD 4413724 / 525 LHD 4829527 / 525A LHD 4516730 / 528 LHD 4757156 / 528A LHD 4551961) and for 525+528 all years of manufacturing only automatic gear box only LHD-models, circle 1, you need 1 for 1 car