i was looking at a rear window visor for the bb4 preludes, and it looks like it would fit better then the one i have that they say is made for bb6's. so i was wondering if any one here knows how close the top part of the rear windows where the rear window visors would mount are alike. if maybe the rear window visor for the 4th gen lude fit on the 5th gen lude. thank you very much!