This back door came from a 418S Rhapsody II that I parted out in July of 2023.

The metal panel offered here measures 28.750 inches long.
The full width including the lip which is hidden when installed is 11.500 inches.
I am measuring to the nearest 1/8 of an inch.

If there is any doubt in your mind measure the opening on your machine before ordering.

Depending on model, the Rock-ola Parts Catalogs name this item as the
Back Door Assembly, the Back Door & Cushion Assembly, the Back Door & Bumper Assembly or the Back Door Riveting Assembly.