I'm looking at this thread: http://mmb.maverick.to/showthread.php?t=35488&highlight=PANEL+DIFFerences and I notice that one set of panels appears to not have an ashtray. Did some panels not come with an ashtray? My sets from 73 and 76 both have the ash tray but in different locations. One on the side (the 76) and one along the armrest ( the 73). How rare are rear panels without the ash tray?