Exchange water pump for 525 from 03/1978 up only automatic gear box 528i+M535i from 03/1978 up, you need 1 for 1 car (525 LHD 4861738 / 525 RHD 4505504 / 525 A LHD 4525765 / 525 A RHD 4535562 / 528i LHD 5374569 / 528i RHD 4765407 / 528i A LHD 4781634 / 528i A RHD 4790647)
Exchange water pump for 525+528+528i up to 03/1978 (525 LHD 4861738 / 525 RHD 4505504 / 525 A LHD 4525765 / 525 A RHD 4535562 / 528i LHD 5374569 / 528i RHD 4765407 / 528i A LHD 4781634 / 528i A RHD 4790647) and for 525+528+528i up to 09/1979 and for 525 from 09/1979 only manual gear box, you need 1 for 1 car