Fully agree with LorSar - to get the match you need the data card.
Looking at what is in there now, after many years, with use, exposure to sun etc is quite difficult. You would need to find a piece that was folded over and protected from any invasive items.
The springs and/or the padding will tell the tale when you take the covers off.
I had the pad replaced in my 280 SL. I could tell I was sitting on the springs!