aperture it should be appreciated that separate bracket members may be mounted to the vehicle trim panels alternatively the brackets for receipt of the locking knobs may be formed integrally with the trim panel to enhance the appearance of the vehicle when the roller is not installed yet another embodiment is contemplated in which the brackets themselves may be rotated to engage the flanges with their respective slots thus in the preferred embodiment shown in fig3 the roller shade assembly having end cap 10 is initially positioned in a vehicle with its slot 13 facing an upward direction and its flanges 16 extending in a horizontal direction relative to the vehicle trim panel once the end caps are axially compressed and inserted into the trim panel the entire assembly is preferably rotated approximately u00bc turn securing the assembly in place and rotating slot 13 to face a substantially rearward direction in the vehicle thenceforth the shade can be pulled and retracted from the assembly in a conventional manner alternatively installation might proceed by initially positioning the assembly with slot 13 facing a downward direction then rotating the assembly to bring the slot upward to face a rearward direction in the vehicle in either of these techniques an approximately 180 u00b0 rotation would.