Abstract: A window guide for a motor vehicle door, a door frame for a motor vehicle, a motor vehicle with at least one motor vehicle door, and a method for the assembly of a motor vehicle door are provided. A window guide for a motor vehicle door includes a guide element suitable for arrangement on a door frame and a positioning insert connected to the guide element. The positioning insert can be brought into engagement with at least one reference structure formed on the door frame. The positioning insert comprises at least one positioning element for the accurately positioned alignment of an attachment part that can be arranged on the door frame.