Hello Jan,
I went through the restoration of the window mechanisms in January on a 280SL from 1968, using the same set of parts from SLS as you show in your pictures, and with the same initial puzzlement as you as to the mismatch in number and shape of some parts. In answer to my question, the SLS guy who answered told me, as mrfatboy already explained, that the kit applies to several different models and that I wouldn’t be using all the parts.
The SLS answer was correct, but incomplete, in that you also need to recycle some existing/old parts, for which this kit does not provide a suitable replacement. To be more precise, I could never figure out how some obviously needed replacement SLS parts (F below) could be used on my car. So, here below, I will outline what I did and the parts I used, but if you (or anyone else) can figure out what I couldn’t, I’ll be interested to find a better solution.
Using letters to match your picture of parts:
A B C D
E F G H
I J
K
A matches C
B matches D
E matches G
F should replace H but I wasn’t able to figure out how to use it, so I recycled all parts H from the existing mechanisms and reused them (without any problem, only light cleaning needed) and parts F went into the unused heap
I matches the spacer between hand crank and hand panel, as mrfatboy outlined, although of the wrong color (black instead of cream)
J and K are of no use on our cars
The only parts which could be worn a little bit are the slider (C) and its opposing part (D) but, although I replaced them with their new counterparts (A and B), I couldn’t detect any deterioration in the parts I replaced, except for a slight yellowing in spite of cleaning. G could maybe weaken with time, so replacing it with E makes some sense.
All in all, the good news is that at the end of the day, I was able to restore the mechanisms in a satisfactory manner, and it wasn’t rocket science (although adjusting the window pane so that it glides smoothly all the way up/down, stays horizontal, and doesn’t whistle at high speed with hard and soft tops took a long time and many trials). Hope this helps.