Abstract: A window frame carried on the door of a vehicle is in the form of an aluminum extrusion having a smooth bend in the region where the top of the frame meets the corner between the "B" pillar of the vehicle and the vehicle roof. The window glass has a sharp angle matching this corner. The aluminum extrusion carries a flange and is formed with a channel by means of which the window sealing and guiding strip can be secured to the frame. The sealing and guiding strip has a mitered corner matching the sharp angle of the window glass. For supporting the sealing and guiding strip in the region of this corner, a separate metal corner piece is provided. This has a shoulder which is a tight press fit into the channel on the aluminum extrusion. It is supplied to the vehicle manufacturer already attached to the sealing and guiding strip itself, so that the strip and the corner piece can be fitted to the frame in substantially a single press-fit operation.