 Most often, variants were applied on two-door hardtop or coupé models, spanning all types of vehicles from economy compacts to flagship personal luxury cars, in which latter exploding realm they became “recognition elements” seeking to add a vintage element to their styling.The windows were intended to offset the significant blind spots created by wide C-pillars that were characteristic of many American cars produced at this time.In an age of decreasing dimensions and increasingly common use of non-opening rear side windows on 2-door models, a variety of shapes of rear windows may have helped passengers there to feel somewhat less claustrophobic.