Thanks, Looking at 48 models . I did notice on the driver side vent might have a larger opening where the outside air came through & maybe the handle.
1948 3100 1948 Fleetline Areo 1951 Suburban Carryall ( http://photobucket.com/51Burb ) 1957 3100 " Tell me who U Hang with & I'll Tell U who You are "!