This part is listed by BMW as BMW part number 11721427911 (11-72-1-427-911) and is described as Secondary Air Pump for E39 5 Series 528i for the model years 1997 and 1998. Not for 528i after the 1998 model year.
This auxiliary emission air pump is only for the 1997 and 1998 model years. If your E39 528i is after that, it will use a different unit than this.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
E39 (97-03) > 528i 97-98