A vehicular assembly formed as a complete unit prior to installation and adapted to be installed as a unit from the exterior of the vehicle body with only final securement of attachment means being necessary from the interior of the vehicle body. The assembly includes a molded plastic casing or gasket, a transparent window around which the casing or gasket is molded, and an attachment member. The attachment member may be a continuous rigid frame concealed from view from the outside of the assembly having a portion embedded within the casing and a portion extending from the casing by which the entire assembly is secured to the vehicle body. Alternately, separate attaching members are embedded within the casing. Decorative strips may be secured to the casing exterior. The casing may be molded around only one edge of the window thereby forming a flexible, resilient hinge allowing the window to be moved between open and closed positions. The hinged version may be used when the attachment member is either an external frame, a continuous rigid frame embedded within the casing, or individual members embedded within the casing.