Before the day gets too hectic.......

In doing research and work on my '47 3100 ---first series--I have a question.
My much worked on and basic truck has posed many mysteries and created questions that someone here seems to always have an answer for. So here goes......

Did the seat backrest have a "cover" that sealed the backrest springs from sight? My truck doesn't have corner windows so it's almost impossible to see the open backrest.
I don't know if this backrest cover was for later models, models with corner windows, or was standard on ALL models?
There's not one on there now but doesn't mean originally there was. Weird things happen over 70 years.
Someone here has to know about this.

And...................."Merry Christmas to Everyone!"