When it comes down to it we have nine instances of 1928 Renault Monasix Cabriolet Landaulet [Type RY] in Hollywood films, all of which are one way or another suggested to be the same vehicle with several links in the comments to that effect. But:

5 are listed as "limousine":
https://www.imcdb.org/vehicle_71272-Renault-Monasix-Type-RY-1928.html
https://www.imcdb.org/vehicle_353979-Renault-Monasix-Type-RY-1928.html
https://www.imcdb.org/vehicle_517404-Renault-Monasix-Type-RY-1928.html
https://www.imcdb.org/vehicle_532635-Renault-Monasix-Type-RY-1928.html
https://www.imcdb.org/vehicle_583651-Renault-Monasix-Type-RY-1928.html

3 are listed as "sedan":
https://www.imcdb.org/vehicle_279696-Renault-Monasix-Type-RY-1928.html
https://www.imcdb.org/vehicle_352164-Renault-Monasix-Type-RY-1928.html
https://www.imcdb.org/vehicle_532633-Renault-Monasix-Type-RY-1928.html

1 is listed as "convertible":
https://www.imcdb.org/vehicle_294308-Renault-Monasix-Type-RY-1928.html

To illustrate the confusion, the "convertible" has a comment suggesting it's likely the same as https://www.imcdb.org/vehicle_352164-Renault-Monasix-Type-RY-1928.html - listed as a sedan and, in turn, has a comment suggesting it's the same as https://www.imcdb.org/vehicle_71272-Renault-Monasix-1928.html - listed as a limousine...

Comments?