E83 (X3 2.0d, X3 2.0i, X3 2.5i, X3 3.0d M57N, X3 3.0d M57N2, X3 3.0i). E83N (X3 1.8d, X3 2.0d M47N2, X3 2.0d N47, X3 2.0i, X3 2.5si, X3 3.0d, X3 3.0sd, X3 3.0si). You don't need to follow the first 4 digits of the BMW part code because they only show the head and subcategory.