Apparatus and method for providing a movable window in a vehicle

A body frame of a vehicle, comprising:

• a rear wall extending between a pair of pillars of the body frame;
• a reinforcement beam that is spaced from the rear wall to define a gap, the reinforcement beam having an inner reinforcement and an outer reinforcement secured to each other, wherein the reinforcement beam extends between the pair of pillars of the body frame;
• a rear window opening partially defined by the rear wall and the reinforcement beam;
• and
• wherein the body frame is configured for use with either a fixed window or a moving window, wherein the fixed window when secured to the body frame is fixedly secured to the reinforcement beam and the rear wall and the fixed window has an overmolding located about a periphery of the fixed window and a bottom portion of the overmolding traverses the gap and wherein the moving window when secured to the body frame moves in the gap.