Would have been helpful if you would include when and where your car or the one in question was built. Just a suggestion in the future since we sometimes run into issues with runnign changes or differences between how these cars were built at one assembly plant verses another
To the question - yes at least the ones I found examples of did have upolstered rear seat side panels
Example 8F01J2161xx below (purple arrows) shows the end trim caps on the upper forward corner where the lower right example (green arrow) is a standard interior example with no trim piece
Hope this helps
Sure there are people who restored their cars and just simplified things by not replacing the material over and went with painted metal on their cars.