This part is listed by BMW as BMW part number 11311318659 (11-31-1-318-659), and is described as Genuine BMW O-ring for VANOS filter on S54 engine.
This 10.82x1.78mm o-ring is used on E46 M3 (2001, 2002, 2003, 2004, 2005, 2006), Z3 M Coupe, M Roadster (2001-2002), and E85/E86 Z4 M Coupe, M Roadster (2006, 2007, 2008).
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
3 Series
E46 (99-05) > M3
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 M - S54
E85 / E86 Z4 (03-08) > Z4 M